Reading Aranet4 sensor data from Python
How to get current readings from your Aranet4 CO2 monitor
Python
Handling and confirming (interrupt) signals in Python
Learn how to handle interrupts and other signals in Python.
Python tarfile directory traversal
Currently, there’s a lot of hype around the behavior of Python’s tarfile module for extracting archives. In short: tarfile will not sanitize filenames in arc...
Bypassing regular expression checks with a line feed
Regular expressions are often used to check if a user input should be allowed for a specific action or lead to an error as it might be malicious.
Exploiting Python pickles
How unpickling untrusted data can lead to remote code execution.
UnicodeError when running Python script via macOS LaunchAgent
If you are getting UnicodeErrors when reading/manipulating files using a Python script launched by a LaunchAgent or crontab, the problem might lie in the “cu...
Watch a log file and send new lines to an HTTP endpoint – with log2http
Recently, I wanted to watch a couple of log files for new entries and have them sent to an http endpoint for collection and later analysis. I did a quick res...
python-fmrest compatibility with the new FileMaker 17 Data API
A few hours ago FileMaker 17 was released, and with it an updated Data API, which is now finally out of trial phase.
Using launchd agents to schedule scripts on macOS
Even though launchd has been around for quite some time now, I was still using crontab for scheduling some of my scripts until recently. Since launchd Launch...
Load password protected Excel files into Pandas DataFrame
When trying to read an Excel file into a Pandas DataFrame gives you the following error, the issue might be that you are dealing with a password protected Ex...
Bokeh plots with Flask and AJAX
Tutorial on creating Bokeh plots with an AJAX data source, served from an existing Flask app.
The basics of Logarithms – with examples
Logarithms are widely used in computer science (e.g. for algorithm analyses, floating point number limitations, scaling data, feature transformations). Not c...
Count elementwise matches for two NumPy arrays
Let’s say we have two integer NumPy arrays and want to count the number of elementwise matches.
Running Flask on macOS with mod_wsgi/wsgi-express
Tutorial on setting up your Flask application to run on macOS with WSGI
Pandas: Select rows that match a string
Micro tutorial: select rows of a Pandas DataFrame that match a (partial) string.
Comparing two Excel columns with Pandas and Numpy
Having been asked multiple times if I can quickly compare two numeric columns from an excel file, I set up a small Jupyter notebook (and an R script) to show...
Display inline images in a Jupyter notebook with Matplotlib
Today I was working with the MNIST handwritten digits data and wanted to display a few images in a Jupyter notebook. After looking at PIL, then Pillow, I fou...
Debugging Jupyter notebooks
While searching for ways to debug code in a Jupyter notebook, I found a lot of outdated posts. So I decided to quickly write up my findings.
Resolving import issues when deploying Python code to AWS Lambda
AWS Lambda is Amazon’s “serverless” compute platform that basically lets you run code without thinking (too much) of servers. I used Lambda in the past, thou...
Indexing: A few handy ways to access NumPy arrays
The following code snippets should serve as an (incomplete) cheat sheet for accessing NumPy arrays. All examples expect an import numpy as np.
Working with FileMaker data in Python
This is an old post. You may also be interested in accessing your FileMaker database via the new Data API. I wrote a Python wrapper to make it easier: python...