TIL (Today I Learned)
The TIL series of articles contains very short articles documenting something I learned “today”.
Today I learned that I can use the percent sign to run commands from inside Jupyter notebooks.
Today I learned that Python has nested Easter eggs in the standard library.
Today I learned that Polars allows non-strict vertical concatenation of dataframes with the parameter how="vertical".
Today I learned how to create standalone Python scripts with uv.
Today I learned how I can use the method 'groupdict' from a regex match to get a dictionary with all named groups.
Today I learned that if you suppress the exception KeyboardInterrupt then your program is still interrupted but it doesn't display a traceback.
Today I learned that the hash of an integer is the integer itself, except for -1. The hash of -1 is -2.
Today I learned how to allow my custom objects to be unpacked into keyword arguments like '**kwargs'.
Today I learned how to use the Polars function pl.date_range to create date sequences with calendar-aware intervals between dates.
Today I learned how to use shell scripting to activate my virtual environment automatically when I change directories.
Today I learned about 5 useful pytest options that let me control what tests to run with respect to failing tests.
Today I learned how to debug the new Python REPL with _pyrepl.trace and the environment variable PYREPL_TRACE.
Today I learned how to fix an issue with Ctrl+left and Ctrl+right not working in the new Python REPL on MacOS.
Today I learned the difference between __getattr__ and __getattribute__.
You can use the Python built-in function iter with two arguments to create an iterator from a function.
Today I learned how to order the values of a dictionary according to an iterable of keys.
Today I learned how to create git aliases in my .gitconfig file.
Today I learned how to get the size of the terminal your code is running on.
