Visiting PyGrunn 2025

Posted on May 19, 2025 by Marcel-Jan Krijgsman

Conferences are a great way to learn diverse topics in your field. That’s why I like to go to events like Pycons and last Friday, PyGrunn. PyGrunn is a Python event in Groningen, the Netherlands. I submitted two talks for the event myself. One of them was selected.

Here is a recap of the talks I attended and the stuff I learned, so you maybe get inspired to attend Python conferences and even speak at these events.

Keeping your Python in check – Mark Boer

Python was originally developed to make coding more accessible. Where at other programming languages you had to tell what type of data type your variables are, Python deduced this automatically. Good for beginning coders, maybe not so good for advanced data solutions.

Mark Boer has experience in strong typing in his data science solutions. He shared how you can ensure typing in different ways: in data classes, using Pydantic and named tuples. The talk assumed that the attendees already had experience with typing. I had not, so it was a lot to take in. But if I can review the video in a few weeks, I hope to catch on.

Building a serverless character profile creation pipeline using Python and AI – Jochem Kleine

This was a surprising talk. Before I was wondering what a “character profile creation pipeline” was. It turned out that Jochem creates games in his spare time. And he was looking for a way to use LLMs to help to create a user’s character in his adventure game Roads. He uses a OpenAI model to dynamically ask the user philosophical questions.

The questions are have a Myers-Briggs, DISC method vibe to them. That’s not unexpected, since the prompt instructs the model like that in its prompt “You are creating a personality assessment for a game character”.

The answers will not only define the user’s character, but also are used to generate an image of the character, also with an AI model.

Jochem then did a demo where he created a character for one of the organizers. The game/AI model asked 6 questions about personal growth, community benefit and negotiation (“You discover a hidden path leading to a treasure guarded by a dragon”). After the questions were answered the game generated an image for the user: a dwarf with a map in his hands. It’s a fine use of personality assessments, I’d say.

Django Template LSP: Smarted Completions for Django Templates – Kees Hink

I don’t know a lot about Django. I’ve done very little with this framework (for creating websites). And yet I’ve learned some interesting things at this session by Kees Hink. He and his colleagues at Four Digits created a solution in VSCode that can autocomplete code in Django templates based on the Python code in that Python project. Meaning something similar should be possible for my CV generator.

Repos are like children, parenting 101 – Bart Dorlandt

For this talk Bart Dorlant took this analogy of your repositories being like your babies and took that analogy quite far. Like how you make sure they grow, stay on the right path and make sure they can take care of themselves.

Along the way he explained what tools you can use to improve your Python repositories. I definitely learned some stuff here, like how you can use Cookiecutter or Copier to create new projects based on templates.

He also has created a tool to convert your poetry projects to uv projects. Definitely something I will check out: https://github.com/bartdorlandt/convert_poetry2uv/

Leveling up your teams with guilds – Marcel-Jan Krijgsman

Next it was my turn. I had prepared a talk about how teams can learn from each other in a Python guild. I think it was well received. I enjoyed doing it.

I hope someone has a photo of it. The video will be online in a few weeks I think.

Make LLMs Fun Again: MCP the usb-c for LLMs – Alex de Vries

This is why attending conferences like this one is useful. There is so much stuff going on in our field. And there’s always someone who already tested the waters. Alex de Vries talked about these Model Context Protocols. I heard about them, but didn’t have time yet to find out what they are about.

Alex had created a LLM solution to create a LLM solution that can plan his bike rides and find a place to sleep at the end of a ride. He explained what MCPs are, where you can find them (smithery.ai) and how you can use them.

So how can these MCP’s work? Well, you can for example use Github’s MCP. Forgot how to do a thing with git commands? Now you just can talk to your model: “Push this change to my repo”, and it will generate the appropriate git command.

Keynote: Homo ludens, Python and play – Daniele Procida

Usually keynotes are done at the start. At this conference the keynote was at the end. Luckily Daniele Procida from Canonical had an engaging talk about Python, play and I guess philosophy. I think what it came down to was: when people offer their spare time to work on open source projects, how do we make sure they are appropriately appreciated for it?

Speakers diner

Because I was one of the speakers, I was invited for the speakers diner of PyGrunn. I wouldn’t say no to a diner invitation of course. But it was also fun to talk to people from many Python backgrounds. We had engaging discussions about AI (of course), but also about e-ink displays (one of my favourite topics), hacking cars with Python, hacking and security in general and many other things.

I had a great time. I definitely would recommend attending PyGrunn next year, or AIGrunn this year.

Oh one more thing: I mentioned I’m riding Tour for Life for the Daniel den Hoed Foundation for cancer research this year. If you want to support me, you can do so here: https://supporta.cc/lfqd/z0qpn9xqox . Thanks!

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My experiences with agentic AI

Posted on May 9, 2025 by Marcel-Jan Krijgsman

Originally I wanted to write a blogpost about what data engineers are going to do with AI writing their code. But before I can write that, I need to share my experiences so far. Because from this you’ll get an idea where they work and where they lack.

This is not meant as a treatise of AI coding assistants and agentic AI tools. But here are some of the tools I’ve tried:

  • I’ve worked with VSCode and Copilot now for at least a year.
  • I regularly use ChatGPT and Phind.com for advice on programming tasks.
  • I’ve used VSCode with Cline / Roo Code extensions and LLM models.
  • And I’ve used Claude Code (which is not free, but there seems to be a trial amount of free tokens). Claude Code works from the command line.

The agentic AI solutions are interesting. They are quite capable to create whole Python projects based on your requests. But it doesn’t mean these projects will work right out of the box. Usually there needs to be some tweaking and restarting and checking results.

Projects where I’ve used agentic AI solutions

Here are some projects I’ve used agentic AI tools for.

Create a showcase demo of Kafka as streaming solution

I was bored with my regular Kafka exercises for our data engineering course. I wanted to have something that would look like Kafka streaming in the real world. So I asked Cline with DeepSeek (instructions I’ve used can be found here: https://youtu.be/NYVaCr3T1T0) and Claude Code to create a producer that would read traffic data in the Netherlands and a consumer that would so something with that.

Cline with DeepSeek-chat-free via OpenRouter

My prompt was pretty vague:

I want to create Python code that retrieves realtime traffic data from https://api.rwsverkeersinfo.nl/api/traffic/ and places it on a Kafka topic.
The Python code and the Kafka producer should be running on Docker containers.

What worked:

  • It created a whole Python project with necessary files and directories.
  • It wrote a producer.py and a consumer.py.
  • It created the necessary Docker compose file.

What didn’t work:

  • I forgot to tell that this architecture needed a Kafka broker. When the agent ran the solution the error that the Kafka broker was missing – to me at least – was very clear. It kept changing and changing the code. But not the docker-compose.yml. I even told it in the comments: add a Kafka broker. But it wouldn’t get it.

This last issue, where the AI agent is spinning its wheels but doesn’t get any further, is quite common.

Claude Code with Claude Sonnet 3.5

Learning from the Cline with DeepSeek experience I added to the prompt that a broker should be created. Unfortunately I forgot to save the prompt I’ve used, but it was similar to the prompt I used with Cline, with the added broker.

What worked:

  • It created a whole Python project with necessary files and directories.
  • It wrote a producer.py and a consumer.py.
  • It created the necessary Docker compose file.
  • It created a very nice Streamlit frontend for the visualisation.

What didn’t work:

  • It didn’t look for one moment at the data coming from the REST API. It just assumed the JSON structure would have certain attributes. For example it assumed there was data of road obstructions with a start and end GPS location. So that it could draw a line on the map. But the REST API had only a starting point.

This version was close enough for me to fix it and get a working end result. And it’s a result that I’m quite happy with. It works well as a demonstration for students. The Streamlit frontend was more than I had hoped for.

Refactoring my Robi scale OCR data extractor solution

I read somewhere that Claude Code is quite good at refactoring code. So I was wondering what it would do with my code. For this I offered it my Robi scale OCR solution. After I made a backup of it of course.

Claude Code with Claude Sonnet 3.5

My prompt was very simple: refactor this Python project.

So what did it do?

  • It replaced print with the logging library.
  • It introduced strong typing.
  • It rewrote my code completely to object oriented Python with one class called MeasurementExtractor and many methods underneath it.
  • It made a list called segments with tuples with coordinates where in the image certain values could be found instead of my ugly line by line command to extract this data.
  • And probably a lot more stuff.

What worked:

  • It did indeed do a whole lot of refactoring.
  • The .py file still ran without errors.
  • The output data was still of the same quality after the rewrite.
  • The logging on the terminal is more concise.

What didn’t work:

  • Sometimes pytesseract recognises an “a” for what should be a “4”. Despite all the strong typing, the new version doesn’t catch those.
  • I had a hard time understanding the code in this new version.
  • It didn’t create unit tests or a readme.md. (But I didn’t ask for that specifically.)

I’m pretty impressed by this result. As you can see it changed a lot. Too much in fact for me to learn from it. In future attempts I will probably ask it just to change certain aspects of my code. Or ask “what would you improve first?”. Go in smaller steps, so I can still follow its logic.

Creating an astronomy monthly digest

Every month I make a podcast episode about what’s can be seen in the night sky. It contains info about what planets can be seen, the phases of the moon, things to see in the night sky with the unaided eye and things to see with binoculars or a telescope.

It always takes me an hour or 2 to compile this from several books, magazines and websites. It would be a nice candidate for automation maybe?

For this I went all in with a big prompt. Probably too big.

Claude Code with Claude Sonnet 3.5

My prompt was as follows:

Here is what I want you to create. For my astronomy podcast I need an overview of things people can see in the night sky in the next month. It should have the following topics:
1. What planets are visible. What planets are not visible. Include Uranus and Neptune.
2. The phases of the moon.
3. Things to see with the unaided eye. Like conjunctions of the moon and planets or the moon and bright stars.
4. Things to see with a binocular or telescope. Like clair obscur effects on the moon. Interesting conjunctions of the planets with certain bright star clusters or other things of note.
5. A separate overview of the Galilean moons of Jupiter. Include transits of the moons and their shadows. Leave this section out if Jupiter is hard to view.
6. A separate overview of the moon Titan of Saturn. Include transits of the moons and their shadows. Leave this section out if Saturn is hard to view.
7. Any upcoming planetary spaceflights, like launches, landings or flybys.
The output should be a nice PDF file.
Create this in Python with its own virtual environment in uv.

I forgot to tell it should be made for observers in the Netherlands.

But anyway, Claude Code got to work.

What it did it do?

  • It created separate modules for visible planets, phases of the moon, naked eye astronomical events, events visible by binoculars or telescope and the moons of Jupiter and Saturn.
  • For getting spaceflight events, it used BeautifulSoup4 apparently to scrape this info from somewhere.
  • It created code to generate a PDF with the astronomy digest.

What did work?

  • After some in between rewrites by Claude Code to solve errors, there was a working project that created an astronomy digest in the form I requested.
  • It even had a graph with moon illumination over the next period.
  • It correctly identified that Mars would pass the Beehive Cluster (M44) at the beginning of May.
  • It had correctly identified interesting features to see on the moon, like “The Golden Handle”.
  • It added deep sky objects to see, even though I didn’t needed those.
  • It had one upcoming launch of a space mission.
  • It created example output for Amsterdam and New York. The location can be entered as argument of the main.py file.

What didn’t work?

  • The next month was interpreted as “06 May 2025 to 05 June 2025”, not “June 2025”.
  • According to the digest only Mars would be visible. That is not true.
  • Upcoming spaceflight events were scraped from somewhere and hardcoded in the space_mission.py file. So events will get outdated and the code will run out of events next year.
  • The description of events was not wrapped in the PDF and therefor not readable.

Not quite what I was hoping for, but impressive that Claude Code got this far. Halfway through it ran out of free tokens or whatnot. And the total cost of this exercise was $2.70.

VSCode with Roo Code and claude-3-haiku-20240307

I done this during a Pizza and Vibe Coding session at DIKW Intelligence last May 7th. My colleagues demonstrated how to use VSCode with Roo Code and we had an API key with some money on it.

Following my colleagues example, I first ran in orchestrator mode and asked it to create a project plan first. This was my prompt for that:

Make a plan in markdown named waarneemgids.md for the following:
This needs to be a Python project with its own virtual environment in uv.
For my astronomy podcast I need an overview of things people can see in the night sky in the June 2025 from Utrecht, Netherlands. This should include things to see in the whole night from sun down to sunset.
It should have the following topics:
1. What planets are visible. What planets are not visible. Include Uranus and Neptune.
2. The phases of the moon.
3. Things to see with the unaided eye. Like conjunctions of the moon and planets or the moon and bright stars.
4. Things to see with a binocular or telescope. Like clair obscur effects on the moon. Interesting conjunctions of the planets with certain bright star clusters or other things of note.
5. A separate overview of the Galilean moons of Jupiter. Include transits of the moons and their shadows. Leave this section out if Jupiter is hard to view.
6. A separate overview of the moon Titan of Saturn. Include transits of the moons and their shadows. Leave this section out if Saturn is hard to view.
7. Any upcoming planetary spaceflights, like launches, landings or flybys.
The output should be a nice PDF file.

As you can see, I learned from my earlier attempt with Claude Code and made the prompt a bit more specific. I just asked it to create a digest for the next full month, and asked to create it for a specific location.

What did it do?

  • Instead of creating a project plan in markdown, it created the astronomy digest in markdown.
  • It said that all planets except Uranus and Neptune would be visible to the naked eye. Generally that’s true, but not in June 2025.
  • It explained what phases of the moon exist. Instead of telling what date the phases of the moon would be visible.
  • And the rest was also pretty generic.

I can be brief here. It did create a virtual environment in uv, but never created a Python project structure.

I will probably try this again, but in smaller steps. Just start with a list of visible planets. Then add phases of the moon. And so on. Also I think I’ll ask it to make a Streamlit application for it with a calendar to select the month, instead of generating a PDF.

Conclusions

Some people expect that AI solutions should be entirely perfect and if they are not, they have failed. But I can see this only improving.

Take the Kafka exercise. It didn’t work for sure. Not looking at the incoming data structure was a mistake. But guess what? Claude Code just had an update and it can now look things up on the internet (providing I will approve). Claude Code took a lot of work from me, before I started fixing it. For me that’s still a plus.

I think I’ll see myself working together with agentic AI solutions in the future, providing this is allowed at my future work sites. Do I still need to check its work? Definitely! Will it speed up my development and allow me to do more ambitious projects? Also definitely.

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Profiling data with ydata in PySpark

Posted on April 24, 2025 by Marcel-Jan Krijgsman

When you got a dataset to explore, there are several ways to do that in PySpark. You can do a describe or a summary. But if you want something a little more advanced, and if you want to get a bit of a view of what is in there, you might want to go data profiling.

Older documentation might point you to Pandas profiling, but this functionality is now part of the Python package ydata-profiling (which is imported as ydata_profiling).

I’ve been following this blog on starting with ydata-profiling:

https://www.databricks.com/blog/2023/04/03/pandas-profiling-now-supports-apache-spark.html

Getting ydata-profiling to work is not exactly a walk in the park. You’d think you can just feed it your messy dataset and it will show you what the data is like. But I encountered some problems:

  • I got errors about missing Python packages in some situations.
  • ydata doesn’t seem to like dataframes with only string columns.

Python packages

I’ve followed the examples from the above mentioned Databricks blog. You can do so too, but maybe use a newer version of the package. They use version 4.0.0 and a lot has happened since that version. I’ve used 4.16.1.

On Databricks Community Edition I got this error:

AttributeError: module 'numba' has no attribute 'generated_jit'

This Stack Overflow answer tells you how to deal with that:

https://stackoverflow.com/questions/78252285/attributeerror-module-numba-has-no-attribute-generated-jit

You probably need data types

I used a couple of favourite datasets like olympic athletes and the asteroid dataset of the Minor Planet Center. And also a csv file I generated with lots of data quality issues.

This error occurred quite a lot when I tried to feed the raw data to ydata-profiling:

java.lang.RuntimeException: Cannot determine the number of cols because it is not specified in the constructor and the rows RDD is empty.

Which is followed by this error:

Caused by: java.lang.IllegalArgumentException: requirement failed: Vector should have dimension larger than zero.

I’ve found that some other people ran into this error and it seems to be related to dataframes with columns that are all strings? Though when I casted one of my columns in the athlete date frame to integer, the issue wasn’t solved immediately.

So you might need to so more casting to correct data types. Which is bad for datasets that actually do have columns that are all strings for good reasons.

ydata-profiling usually works better with bigger datasets. I tried it on small dataframes with about 10 rows and some columns that were all NULL and it doesn’t seem to like that.

Running a ProfileReport

If you manage to solve that, you can run a profiling report with this code:

from ydata_profiling import ProfileReport

report = ProfileReport(athlete_df,
                title='Athletes',
                infer_dtypes=False,
                interactions=None,
                missing_diagrams=None,
                correlations={"auto": {"calculate": False},
                              "pearson": {"calculate": True},
                              "spearman": {"calculate": True}})

And then show the results with this:

report_html = report.to_html()
displayHTML(report_html)

You can view the results in a notebook on Azure Fabric or Databricks.

The ProfilingReport

The report starts with some statistics:

The more interesting part, is the Alerts tab. I was quite surprised to see that the athlete dataset has duplicate rows:

It had a link that in my Databricks Community Edition didn’t seem to go anywhere. But a table with duplicate rows is at the end of the report:

Turns out the art competitions (yes the Olympics had those once) seem to be the only rows affected.

The alerts also show possible correlations and zeros.

Then it has statistics for each column. Take for example the Sex column.

Okay. It’s 2025. I know there are more than just male and female genders. But I didn’t know the gender Jr.” or -Smith)”. That points to data load issues that we need to investigate. I’m guessing quotes in strings maybe?

For numeric columns we can get a lot of statistics. Take a look at the details for the Age column:

We can also look at extreme values. Wow! There was a 97 year old athlete? I should query that data. See if that actually is proper data.

[Update 24 April 2025 16:30] I’ve looked up the row for the athlete with the age of 97. The “athlete” was John Quincy Adams Ward from the USA. He competed apparently in the art competition of the summer olympics of Amsterdam 1928. Which is strange, because he died in 1910 80 years old. But his work was exhibited in 1928. He would have been 97 years old then, but that doesn’t make the data less weird.

At the end part of the report we find correlations. I turns out there are correlations between Height and Weight. And that makes sense.

Conclusions

I can definitely see it’s definitely worthwhile to do data profiling with ydata-profiling, even though it might not work immediately at the start. Even for this dataset that I thought I already knew quite well, I ran into surprising results.

For raw datasets, expect to have to do some work to get your profiling reports.

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My experiences with Azure Purview

Posted on April 10, 2025 by Marcel-Jan Krijgsman

At my last customer I have extensively worked with Ataccama, a data management product. It has a data catalog to store metadata on datasets, and it can do data quality checks. In Azure Microsoft has a data management product too. It’s called Purview and I’ve used it in a PoC project.

A very short intro into data management

There’s more to data management than data catalogs and data quality, but I don’t want to rewrite the DAMA-MBOK book. I’ll try to keep this intro pretty short.

Data catalogs have metadata on your data. In this you can find what a table is for, what data in a column means. So that you create data products on the right data with the right kind of outcomes. And also important, who you can contact for more information on that data.

With data quality checks you “profile” a table to see what the data is like: are there NULLs? How many distinct values?. You can then apply data quality rules to make sure that the data adheres to certain rules. Rules like “there should always be a value in this column”, “the data should always be one of a certain number of values”, “the mail column should always be formatted as x@y.z”. Some data management tools allow to create very complex rules.

Purview

Purview got a pretty extensive redesign recently. Last November it got a new portal and the licensing model also recently changed. Last year we paid about 450 euros per month, now it’s “pay as you go”. I think it’s cheaper for most customers who start with data management, but I don’t have direct access to our cloud bills.

To start using Purview in Azure, you need to create a Purview account. I’ve created one last year, but things have changed quite a bit since then. Better to follow Microsoft’s instructions. Important to know: the Purview account is also a managed identity. The managed identity has the same name as the Purview account.

A couple of things you need to know working with Purview. Say you want to use it as data catalog and for data quality on a simple SQL database. These are, in short, the steps you need to take to get all the way to data quality profiling:

  1. Create a “collection” (under Data Map, Domains).
  2. Add a data source. (Connect to your database).
  3. Do a scan on the data source (to find tables and views).
  4. Create a governance domain (under Unified Catalog).
  5. Create a data product and add relevant tables and views to that.
  6. Profile your data (data quality).

My PoC project

Purview has extensive capabilities, but let’s start simple. These are the things I want to achieve:

  • Allow Purview access to my Azure SQL database.
  • Scan for tables and views.
  • Add metadata on these tables and views in the data catalog.
  • Do data quality checks.

To test the data quality checks I have created a specific table with pretty bad data quality: all columns are strings. Date columns don’t adhere to one format. The status column should have three possible values (“pending”, “completed” or “failed”). And the amount column should of course have numeric values.

A table with bad data quality

Database access

I would love to tell you that I have tested Purview on all Azure data storage solutions known to man, but in fact getting access to a simple SQL database was already a challenge. I’ve chosen to use a managed identity. There are two ways to do that:

  • Create your own managed identity. Allow Purview to use it and give it access to the SQL database.
  • Use the managed identity of your Purview account. Give it access to the SQL database.

Long story short: I had the most success with the managed identity of the Purview account. Using my own managed identity did work with a data source scan, but with data quality scans it would not appear as an option. I’ve asked questions about this at the MS community / Learn site and found out the solution myself.

To give Purview access, create a user based on a managed identity and give it access:

CREATE USER [mypurviewaccount] FROM EXTERNAL PROVIDER;
EXEC sp_addrolemember 'db_datareader', [mypurviewaccount]  
EXEC sp_addrolemember 'db_datawriter', [mypurviewaccount]

With this access you should be able to do both scans on the data source and data quality profiling.

Data catalog

Once you’ve created the collections and data source and done the data source scan, the data catalog works pretty straightforward. You can add descriptions to the table and columns.

And you can add data experts and owners. Which is useful if anyone has questions.

In the Schema you can add classifications. For example you can add classifications for Personal Identifiable Information (PII).

There also is functionality for lineage. But I didn’t get lineage discovery (preview feature) working with my managed identity.

Getting data quality profiling working

You’d think that with the data scan done, you’re a small step removed from doing a data quality profiling run. Not quite. For data quality profiling runs you need to have a data product. And to have a data product, you need a governance domain. You can do all that under the Unified Catalog. I’m not going into detail here how to do that. It’s not the hard part.

Unfortunately you need to define a new connection for data quality profiling (though it can reuse Data Source settings). And every time I haven’t used Purview for a while, I forget where in the Purview menus that is situated. So let me document that here. Under Unified Catalog, go to Health management > Data quality. Go to the governance domain, Manage and Connections:

Here I also used the Purview managed identity mentioned above. The other managed identity I created didn’t appear as an option.

Data quality: profiling

With all that settled we should be able to do a data quality profiling run. Remember that table with poor data quality? Let’s see what Purview makes of it. This is the profile page for the table after the profile data run:

Except for transaction_id all columns are nvarchar(255). But Purview detects that amount and customer_id are numbers and date is Date/Time. So far so good.

Lets look at the date column:

So what do we see here? Dates formatted as yyyy-mm-dd. No null values. 7940 rows (of 10,000 rows!). Now lets look at this table in DBeaver:

I see many, many different date formats. This was not worth mentioning?

Same with the amount column.

You’d think that the non numeric values would be worth a mention. A warning of some sort. But the only way I can deduce that there could be some kind of problem, is that the total number of rows in this column is not the total number of rows in the table.

And let’s look at the status column.

Here Purview has found empty values. You get a good view of the distribution of the 4 occurring values.

Data quality: rules

We need clearly need to set some rules here. Like:

  • The status column should not be NULL/empty.
  • The status column should only have values of this list: “completed”, “pending” and “failed”.
  • The date column should adhere to the yyyy-mm-dd format.
  • The amount column should be numeric.
  • The customer_id column should be an integer (ideally it would be a customer_id that exists in a customer table somewhere).

Let’s start with a rule that the status column should have no empty or blank values. For this there is an existing rule type.

I pick the status column, add a description of the rule and click create. Then I do a quality scan. Here is the result:

Wait! What!? A score of 100! This is my data:

There are definitely empty values. Does this rule only check for empty strings and not NULL values? If so, why isn’t there a NULL rule check I can choose from? It’s a problem many people have. (Later I’ve created a custom rule with the notNull expression. Again I got a score of 100. There’s definitely a bug in that expression.)

For the date column I went with a string format match, with a regular expression that checks for the yyyy-mm-dd format:

That is a good result. Not the data quality of this column, but that the bad quality was detected.

Let’s make a rule that the amount column is numeric. Data type match seems to be a logical choice.

But I can’t choose the desired data type.

And the result is a quality score of 100. What?!

It’s starting to look a lot that I will be choosing Custom rules most of the time:

There’s a lot to choose from here. But at least I can pick a very specific rule that does what I want:

I ran a new quality scan and the result is that it found 1004 rows failed. So the rule works.

In the end you will get a total data quality score for your table. Here are the results per rule:

Here you can see that the total quality is medium.

When I applied all rules I wanted (as described above) the total score was 81.8%, which was marked as quality score “High”.

Combined with the data quality scans for the whole governance domain HR the total score is 90.9 or “High”. I guess we’re done here.

Let’s be fair, when you average out data quality scores for all your tables, it’s likely you get high marks in any data management tool. It might fool your management, but not the end users.

Conclusion

Purview has enough to get started with data management on your Azure cloud. Connecting Purview to my SQL database was harder than I assumed it would be. And not everything is documented.

The data catalog is as you would expect. Other data management products can also detect phone numbers, mail addresses and other PII data. Purview is definitely not there yet.

The results of the data quality profiling are confusing. You’d expect all alarm bells would go off for a table with such poor quality. Just a data quality profiling run is not very useful. You’ll have to create rules. The result of the empty/blank fields rule was just wrong. And I can see myself creating custom rule after custom rule to get the real data quality checks that I need.

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Things I learned about Azure Data Fabric

Posted on April 5, 2025 by Marcel-Jan Krijgsman

Currently I’m helping colleagues to read open data in Azure Data Fabric. Here are some of my experiences with it.

I don’t want to do an extensive description of what Data Fabric is. In short, if you have an organisational Azure account, you can enable Data Fabric. You can then create Fabric workspaces and within workspaces you can create lakehouses for storage, pipelines and notebooks for automation. Lakehouses are like data lakes that act a bit like data warehouses with schemas, tables etc.. So you can store unstructured data in them as files, but also have tables you can read with SQL.

Notebooks are quite nice

You can automate stuff by calling notebooks with Python. And the nice thing about that, is that you can add text formatted with Markdown. So you can add nicely formatted documentation about what steps in your notebook are doing.

So it’s code, but it’s also documentation.

Lakehouses need time to start

One of the features data lakehouses bring, is the separation of compute and storage. Storage is cheap and it can stay online. But compute (CPU, GPU) is expensive and you want to not be billed for those longer than necessary. So compute clusters are automatically deactivated after a while.

That’s great, but when you connect again, they take time to start up. If you create many different lakehouses for different purposes in your Fabric workspace, and if you have pipelines that access many of them, each one of them needs to startup. And this can take minutes.

So better go with one big lakehouse with many schemas for different purposes, I think. Though I’ve also been working with several notebooks on the same lakehouse and then I got a message I could only connect with one notebook to a lakehouse at the time.

Where are my files in a lakehouse?

When you’re not familiar with lakehouses yet, and you created files to be stored in the lakehouse, you sometimes wonder: where are they?

Know that the lakehouse explorer has two modes, and the default one (I think) is SQL analytics endpoint. There you won’t see any files. Switch to Lakehouse view and you’ll see the file side of things.

Fabric has Data Factory, but with less debug

I’m not exactly a fan of low-code solutions. I’ve been working with some. Debug seems always to be lacking for one thing. In Azure Data Factory does have debug features actually. But the variant of Data Factory in Data Fabric doesn’t have those debug features. So when you don’t understand what data is going through the pipeline, your only hope is writing the in between data in files or tables.

For example, I have this Lookup action that reads a table with dataset names. And in the Copy data1_copy1 action it is supposed to do an Odata call and store the results that come back. The Lookup1 action does have a preview data option. But there’s no clear way what the pipeline is doing in subsequent actions, what data went through the pipeline. So I’m still quite in the dark why this pipeline is writing the results of each Odata call to all the lakehouse files.

You can also use a Get Metadata action in between. But chances are that if you wanted to use Get Metadata to investigate a failing action that comes after, Get Metadata is now the failing action.

Meanwhile, notebooks do have all the logging and debugging data you’d could want. So if it is up to me, I wouldn’t go with Data Factory pipelines.

Where are my connections?

In Data Factory I find pipelines within pipelines within pipelines already hard to maintain. But then there are connections. Once you have created a connection (to an Odata source or another workspace or pipeline) it is really difficult to find it back.

Someone asked questions about how to find a connection when you have a connection ID and Microsoft answer basically was “Oh, that’s a good idea. We should build an interface for that some day”.

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A great time at PyCon Ireland 2024

Posted on November 17, 2024 by Marcel-Jan Krijgsman

I think it was last year when I announced that I wanted to go back to conferences again. Preferably as a speaker. But what conference is the best for data engineers? I couldn’t quite figure it out. Then the call for papers for PyCon Ireland 2024 came by on my socials and I thought “why not Python?” I do lots of it, even though it’s not always work related. And I’ve never been to Ireland. So submitted two sessions. One got selected right away. I booked my flight and hotel and off I went last Friday (November 15 2024).

Day 1

Let me first of all say that I found the quality of the presentations very good. They were interesting and I was able to follow the topics quite well.

Jaroslav Bezděk started off with a talk about pandas and DuckDB. I know pandas, but I wanted to know more about the second one. Jaroslav’s talk confirmed for me what I already suspected: it is not that hard to start with DuckDB. Nice to see some examples. Certainly a tool I want to try out. I found his slides on Github: https://github.com/jardabezdek/talk-zoology-101.

Then it was my turn to talk about e-ink displays. I’ve grown fond of these devices, combined with Raspberry Pi’s. So I discussed 4 ways that I’ve used them. The slides can be found on my Github page: https://github.com/Marcel-Jan/talk-eink-dashboards.

It was so much fun to be a speaker at a conference again and the audience was very welcoming. Many people talked to me after this and my other presentation and it really makes me want to do this more often.

Mihai Creveti talked about what AI agents can and cannot do. I’ve got a clearer picture now what agents are good for. He also gave examples of tools that are used for this currently. There’s so much in the AI landscape nowadays. It’s good to know where the field is going.

The talk about testable pipelines by Florian Stefan was of great interest to me. He showed how he uses DBT (Data Build Tool) with dbt_expectations for testing of pipelines. dbt_expectations is not only useful for testing. It can also check if quantiles of column values fall within an expected values. So that goes further than just of they have expected values.

Mark Smith from MongoDB demoed an AI agent that can send real world text messages with excuses why he could not make it to the office. And by giving that agent a memory, you can make sure it won’t send the same excuses twice. Weird use case, but otherwise a clear application.

Like me, Cosmin Marian Paduraru, has used Python to solve a personal use case. He wanted to know if he could use visual intelligence to identify new items for his collection of bottle caps and avoid duplicates. He showed what technology he used and what obstacles he encountered. And he showed you don’t always need the latest and largest algorithm for this kind of work. And not a bad try for his first presentation at a conference ever.

James Shields from Bank of America talked about how to get a culture of innovation at your company. I speak from experience that getting a culture of innovation can be hard. It’s hard to get the time, get everyone involved, including management. And even if everyone is willing to innovate, it doesn’t always happen. At Bank of America they use hackathons. And even that is not everyone’s cup of tea. But still they are making great progress.

The Github ecosystem does not only support DevOps but it can also support DevSecOps. That’s what the talk by Eoin and Tom Halpin was about. They showed with a down to earth example how they use Github Actions and Workflows to not only do automated testing, but also do vulnerability scans. You can find their repo here: https://github.com/genai-musings/chatting-with-ChatGPT. I finally understand what these badges are for on the Github page. Certainly something I want to try out BTW.

Next I went to Paul Minogue’s presentation about vector databases. He discussed what vector databases are good for and shared his research on this matter. There were some surprises for me. For example that OpenSearch can be applied as a good vector data store. He also shared the challenges he encountered. I already knew about embeddings, but I’ve learned a lot about the ways you can search through embeddings if there are a lot of them and performance is not good enough.

Florenz Hollebrandse discussed the modular approach they use at JPMorganChase to make sure that when choosing solutions they don’t paint themselves into a corner. They decouple business logic from platform/deployment concerns. This way they are able to reuse more generic software. JPMorganChase open sourced a solution for this, which you can find on Github: https://github.com/jpmorganchase/inference-server.

Then it was my turn again. I was asked if I could prepare my other submission as a backup presentation. So I finished my presentation on how I used Python to prepare for my astronomy podcast the evening before, on my hotelroom. I had a lot to share about how I use ChatGPT to categorise astronomy news articles, how I use embeddings to find similar articles that don’t need categorising anymore (reduces the bill). And flattening the embeddings to 2D or 3D allows you to make nice graphs. My slides can be found here: https://github.com/Marcel-Jan/talk-python-astropodcast

And then there were the lightning talks where people can quickly share a topic of interest. It doesn’t always have to be directly Python related. That’s why the Swedish vessel called Vasa that sunk fairly quickly after barely leaving the harbour (“I’ve been projects on this before”). But also a daring demo of pre-commit, a tool that won’t let you commit unless your code adheres to certain standards. And about creating a Telegram bot with Firestore.

The day ended with pizza and fries. And good conversations with people I didn’t know before. This is such a nice community with many people wanting to share their knowledge with everyone else. It’s heart warming.

Day 2

On day 2 you could follow all kinds of workshops. And yes, a lot of them were RAG and AI agent related. A nice chance to try that out.

So I learned to use a vector database (MongoDB) and RAG to create an agent. And an important concept I learned here was chunking, which is used to break up text to make it possible for the agent to work faster.

Then I thought about following a workshop on scraping, but the room was already very full. So why not do more RAG? You can never do enough RAG. So I followed Shekhar Koirala’s and Shushanta Pudasaini’s workshop, which was about multi-model RAG. What that meant was that you feed your RAG software a PDF and it will separately get text, images and tables out of it. Which you then later can use in an agent.

And lastly I followed Cheuk Ting Ho’s workshop on Polars with Polar extensions. Polars is pandas’ faster sister. For this it has been programmed in Rust. So for the first time I’ve installed Rust on my laptop. I managed to follow the entire workshop. There’s still a lot I need to know before I can implement this on site. But I’ve got a bit of the hang of it.

And that was the end of Pycon Ireland 2024. I must say I’ve enjoyed it very much.

I stepped out of the Raddison Blu and finding myself to find a new purpose of the next of the day. I decided to explore the area of Trinity College a little bit. Because tomorrow I want to visit the Old Library. And a couple of other sights in the area.

I’ve also very much enjoyed dinner. I went to The Winding Stair next to the river Liffey. What an excellent restaurant. I’ll likely visit them again later this week.

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Using OCR to get data from my Robi scale

Posted on November 5, 2024 by Marcel-Jan Krijgsman

How it started

For several years I kept track of my weight and fat with a Soehnle Body Balance, which I bought in 2018. That worked quite well until I saw more and more these weird deviations. Take a look at the red line (fat percentage) in the graph below:

I’ve been training harder in the last 2 years, but according to the fat measurements I gained more fat, not less. And also, after a day of a long bike ride, the fat percentage would peak the next day, instead of getting lower. In the last few months I would regularly get fat percentage measurements of 30+%. And it was not like I was eating burgers, fries and ice cream everyday. It didn’t look like the fat measurements were very accurate anymore.

My new scale

I decided it was time for a new personal scale. After some deliberation I picked the Robi S11. It is a “Smart body composition scale” according to the brochure. It has a handheld device that measures your body fat (and a whole lot of other things) more accurately. It is similar to how my doctor measures my fat percentage during my half yearly checkup. And it was moderately priced.

Now this is one of those scales that has a Bluetooth connection. I’ve always had a healthy mistrust of sharing my health data with apps like these. Especially when the parent company is one Guandong Icomon Technology. Who knows where your data goes to and how securely it is stored?

I decided to give their Fitdays app a try anyway. I filled in the limited amount of personal details (and not all of them entirely accurate). And of course I didn’t give the app any more access to iPhone data than absolutely necessary. For what it’s worth.

The device does an impressive amount of measurements. It measures not just weight, fat, water and muscle tissue. It can do so per arm and leg. And somehow it also can measure bone mass and protein mass in your body. Not sure how accurate and scientific all this is though.

The app shows all these results. And then came the little matter of me wanting to copy all that data. Luckily the app has a “share” option. I was able to Airdrop that data to my MacBook. So I was excited… until I got said data. Because it was in the form of a jpeg file.

Example of the data in jpeg form (only top part because the image is very long).

Your data, in jpeg form

You can’t copy the values. You can’t get the data in any other form. Good luck!

Good luck? Well we’ll see about that. I decided to summon the power of Python! Surely there must be some way to OCR the heck out of this jpg? And, as almost ever, there is a Python solution. Quite quickly I learned there is a Python package called pytesseract that can do OCR.

Using pytesseract for OCR

For a first attempt the code is fairly simple:

import pytesseract
from PIL import Image

im = Image.open("IMG_69EC2B66C329-1.jpeg") # the ROBI image with data
text = pytesseract.image_to_string(im)

print(text)

And sure enough, when you run it, you get this result:

83.2 kg 18.7 %

Gewicht Lichaamsvet

Indicator Waarde Standaard

Gewicht 83.2kg Standaard
BMI 23.0 Standaard
Lichaamsvet 18.7% Standaard

Vetmassa 15.6kg Standaard

Vetvrij

lichaamsgewicht 878k

Spiermassa 63.1kg Standaard
Spiersnelheid 75.8% Standaard
Skeletspier 46.5% Standaard
Botmassa 4.5kg Standaard
Eiwitmassa 13.5kg Standaard
Eiwit 16.2% Standaard
Watergewicht 49.6kg Standaard
Lichaamswater 59.6% Standaard
Onderhuids vet 13.4% Standaard
Visceraal vet 5.0 Standaard
BMR 1830kcal

Lichaamsleeftijd 52 Uitstekend

WHR 0.90 Standaard

Now all I have to do is select the lines with the data that I want, write it to a cleaned up data output, and I have my data in consumable form.

I got a lot of data out of this. But not all. For example, on this multiline name it would get the text, but value was wrong:

As you can see in the result here:

Vetvrij

lichaamsgewicht 878k

It was probably confused by the value being in the middle of the multiline name?

Also it would not get the text from this part with the human image:

It would not get the numbers here (except the “Standard range”):

Segmentale vetanalyse

Standaardbereik: 80%-160%

Standaard

Standaard \\ Standaard
l R l

Maybe that’s something to look into in a later phase.

In any case, I was pretty happy about how easy it was to get the first results. I got enough out of it to start with. Hiding my data in a jpeg is no match for some rudimentary Python skills anymore.

I’ve put my Python code in a Github repository: https://github.com/Marcel-Jan/extract_fitdays_data

Further research

I’ve been thinking how to improve the quality of the results from pytesseract. One approach is to cut parts of the image out, so it can “focus” on these.

But I also read you can do other forms of preprocessing of the image that can help. Like what I read in this post:

https://towardsdatascience.com/getting-started-with-tesseract-part-i-2a6a6b1cf75e

I also want to store my data in a .sqlite database in the future. Now it’s still an Excel sheet. But I could do more in SQL. Maybe make a data warehouse of my own personal data.

To be continued.

Posted in Python | Tagged , , , | 2 Comments

Showing a gift total on a Raspberry Pi with an e-ink display – how hard could it be?

Posted on May 10, 2024 by Marcel-Jan Krijgsman

TL;DR:

These Python and Raspberry Pi projects. They are fun aren’t they? And often they look deceptively simple. But you don’t see all the projects that failed and usually not where they struggled. This project got stuck (and almost failed) at:

  • Not being able to scrape dynamic website content.
  • When I found out how to do that, I couldn’t run my working Python code on the Raspberry Pi.
  • That turned out to be because the scraping packages use a chromium browser, but not for the ARM processor that the Raspberry Pi has.
  • And to top it all off, the Python package for the Inky Impression e-ink display had some kind of problem running numpy.
Continue reading →
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How I memorise my lines (and other things) with Anki

Posted on May 1, 2024 by Marcel-Jan Krijgsman

In my spare time I do stage acting. And there is almost no better feeling having performed a play really well. But to do so, you need to learn your lines. Preferably you learn your text well in advance, so you also have time to play with it.

Memorizing things is not something I’m particularly good at. For remembering things I have apps: calendars, Evernote, mail. But that doesn’t work when you’re on stage of course.

Previously, to train myself, I would record the scenes I was in, without the parts I was supposed to say. And then I would replay that recording and try to fill in the gaps. But it took quite a number of turns to get that right.

Last production I tried something else: spaced repetition. The principle of this is that you space out review sessions where hard questions return earlier and easy questions reappear in your “deck” in later review sessions.

For this I’ve used open source software called Anki. In Anki you create flashcards and Anki will run study sessions where it will determine based on spaced repetition which cards should be reviewed.

In Anki you create a deck. In my case the deck has the name of the play/production I’m studying for.

Here is a flashcard for a hypothetical play called Project Hail Mary. (Unfortunately the Venn diagram between stage actors and sci-fi nerds doesn’t seem to intersect all that much, based on my past experiences. It is still my dream to bring sci-fi to the stage some day.).

I use the line of the actor before me as the question, and my line as the answer. If I have a lot of text, or even have a monologue, I use my previous lines as question and the next line as the answer. I try to keep the amount of text in the answer limited if possible.

I use tags to add a card to a scene. It’s okay that Anki goes through these cards randomly.

When have added your cards and are finished adding more, you can start a study session:

Anki will start showing you the question. You don’t have to answer it. You have to memorise what the answer is.

Then you click “Show answer” and you can select how hard or easy you thought that answering was. If you choose easy, it might take multiple days before the question returns. If you choose hard, it can come back in minutes.

When you have gone through the deck you get this message. And you’re done for the day.

It’s up to you how soon you want to check in with Anki again. Anki doesn’t have some kind of scheduling system. It’s completely up to you to fire it up when you feel the need to study again.

But if you fire up Anki a couple of times per week, you will find that you will get better at it. And it takes significantly less time than my previous method.

And of course this method can be used for many things you need to memorise. Like that Azure DP-203 exam I have on my todo list somewhere.

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Categorising text with ChatGPT. Results may be messy.

Posted on April 12, 2023 by Marcel-Jan Krijgsman

I have a hobby project I’m working on. It’s an astronomy news feed reader. Long story short: I currently gather links to interesting articles about astronomy by hand. And I want to automate this, so that I have more time to actually read the news.

What I want is that an article, based on its contents, will be tagged with a couple of keywords. And also that it is placed in one main category. For example: an article on the discovery of volcanos on Venus can have tags like “Venus”, “vulcanism”, “Magellan” and the main category is “Venus”.

So how to do that in Python? I’ve looked it up and according to Stack Overflow I need to start reading books on data mining and Natural Language Text Processing. Hmm, no. Not for a hobby project. So I was wondering. Can’t ChatGPT do it?

Homer Simpson with his campaign for sanitation commissioner: “Can’t Someone Else Do It?” in episode “Trash of the Titans”

Can’t ChatGPT do it?

Short answer: it can. Here is how I did it. First I learned how to use ChatGPT with Python from Harisson Kinsley’s video on this topic:

YouTube video on how to run simple ChatGPT queries from Python.

As Harrison explains in his video: you are going to need an OpenAI account. And using ChatGPT from Python costs money. Check the pricing here: https://openai.com/pricing. So far I’ve spent a handful of dollarcents for about 50 ChatGPT queries. But if you’re going to experiment with this, don’t forget to set some usage limits, so you won’t get unpleasant surprises.

Creating tags for a text with ChatGPT

The idea is to send ChatGPT a question with the text that needs to be categorised in it. So I create a string “Categorise this text with one to five tags: <text of the article here>”.

newstext = "As Canada celebrates its first astronaut to go to the moon, it is starting a new project that could eventually enable a Canadian to walk on the lunar surface. <more text here>"

user_input = f"Categorise this text with one to five tags:\n\n {newstext}"

message_history.append({"role": "user", "content": f"{user_input}"})

completion = openai.ChatCompletion.create(
  model="gpt-3.5-turbo",
  messages=message_history
)

reply_content = completion.choices[0].message.content
print(reply_content)

And sure enough, it works! Here is are the tags it creates for this article on the Ariane 5 rocket for ESA’s JUICE mission to Jupiter and its moons: https://www.spacedaily.com/reports/Ariane_5_flight_VA260_Juice_fully_integrated_and_ready_for_rollout_999.html: 

space mission, Ariane 5, Juice mission, Jupiter exploration, European Spaceport.

Yes, that looks like a good result.

Here is another article and what tags ChatGPT makes for it: https://www.newscientist.com/article/2367734-tonight-is-your-best-chance-to-see-mercury-in-the-night-sky/

Mercury, solar system, astronomical observations, space viewing, celestial events.

Yup, those are pretty good tags.

And then this happened for this article: https://www.spacewar.com/reports/Thule_Air_Base_Gets_New_Name_999.html

- U.S. Space Force
- Greenland
- Department of Defense
- Pituffik Space Base
- Cultural heritage

Wait, what? Why the dashes all of a sudden? And this time no period at the end.

So ChatGPT 3.5’s results can be as inconsistent as when humans do this thing. Results get better when you tell ChatGPT to deliver the tags as comma delimited:

user_input = f"Categorize this text with one to five tags:\n\n {item['summary_detail']}." \
             f" Print the tags separated by commas."

But that’s the lesson here: you have do be very clear and specific about what you want.

One main category from a list

Now I want ChatGPT to pick one main category from a list I have picked. This is the list:

astro_categories = "Mercury, Venus, Moon, Earth, Mars, " \
                   "Jupiter, Saturn, Uranus, Neptune, " \
                   "Pluto and the Kuiper Belt, Comets, " \
                   "Exoplanets, Formation of the Solar System, " \
                   "Telescopes, Meteorites, " \
                   "Artificial Intelligence, Miscellaneous"

Because you can have a message history in ChatGPT, I can ask follow-up questions, based on the text I gave it earlier.

user_followup = f"Also categorize this text in one of the following categories:\n\n {astro_categories}"
message_history.append({"role": "user", "content": f"{user_followup}"})

completion = openai.ChatCompletion.create(
    model="gpt-3.5-turbo",
    messages=message_history
)

reply_content = completion.choices[0].message.content
print(reply_content)

Let’s see what ChatGPT makes of it.

For the article about the Ariane 5 rocket for the JUICE mission, it picks:

Jupiter.

That’s good. I didn’t ask for the period at the end, but I can work with that.

Now let’s look at the Thule Air Base article. ChatGPT chose this as the main category:

Earth, Miscellaneous.

Wait, what? You are only supposed to pick one!

Or take this article about the Orion spaceship (which BTW seems to be an old article) https://www.spacedaily.com/reports/Orion_stretches_its_wings_ahead_of_first_crewed_Artemis_mission_999.html . What category does ChatGPT pick?

Kennedy Space Center and Orion spacecraft fall under "Miscellaneous".

Just answer the question please.

And sometimes ChatGPT gave me some extensive feedback. Take this article: https://www.spacedaily.com/reports/The_worlds_first_3D_printed_closed_afterburning_cycle_liquid_rocket_engine_successfully_flew_999.html. ChatGPT came up with these tags:

space technology, rocketry, China, Tianbing Technology, TH-11V engine.

But the response on picking the main category was:

The text should be categorized under "space technology" and "rocketry" as these are the most relevant categories. It doesn't fit neatly into any of the specific celestial bodies or topics listed in the second prompt, nor does it relate to artificial intelligence or meteorites.

Sounds reasonable. But you definitely need to be aware of such possible responses before you start relying on ChatGPT’s results.

So then I told ChatGPT to only pick one category. And if you don’t know what to do, pick Miscellaneous.

user_followup = f"Also categorize this text in only one of the following categories:\n\n {astro_categories}." \
               f"If it doesn't fit in any of these categories, categorize it under Miscellaneous."

Well, results were still mixed. Take for example this article from Space.com: https://www.space.com/best-free-star-trek-tng-and-picard-3d-prints . The tags ChatGPT chose are quite correct:

pop culture, television, 3D printing, Star Trek, Picard

What main category does ChatGPT pick now?

Telescopes

Telescopes? Really? The word “telescope” does not appear once in the article. (Also, this time no period at the end!)

Conclusion

First of all: I’m really happy that ChatGPT can come up with relevant tags. That works quite well and I intend to use it.

Second: if you want to use ChatGPT (version 3.5) in your data pipelines, you better be prepared for some very rigorous testing. Because it can sometimes throw some weird curveballs that can mess up the data quality equally well as humans can.

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