TIL (Today I Learned)

The TIL series of articles contains very short articles documenting something I learned “today”.

Today I learned how to create a sentinel value to use as a default argument in a way that respects Python typing.

Today I learned that the largest file ever published to PyPI has 20 MILLION lines of code.

Today I learned how to draw a Bézier curve with the De Casteljau's algorithm.

Today I learned how to create app notifications in Textual.

Today I learned about context variables from the module contextvars and how to use them.

Today I learned about the piece table data structure.

Today I learned how to use Hypothesis to do confident code refactoring.

Today I learned about the Damerau-Levenshtein distance used on strings in the field of genetics.

Today I learned that indentation in Python can be quite crazy.

Today I learned how to customise the Python REPL on start-up.

Today I learned how to read the bytecode from a file of compiled Python bytecode (.pyc).

Today I learned about the generator method close.

Today I learned that generators support membership testing with the operator in.

Today I learned what open recursion is and how to leverage it.

Today I learned how to skip tests on Microsoft Windows in pytest.

Today I learned how to use the VS Code debugger in code from “other” modules.

Today I learned about the skip list data structure.

Today I learned not to cache generators.

Today I learned how to optimise my website images for the web and I automated that process.

Today I learned you can have invisible variables in Python.