Today's example of "you can just do things":

A colleague complained about Python's error message "TypeError: unhashable type" being hard to understand when trying to use eg a list as a dict key or set element. I also always have trouble explaining this problem to beginner students, so I filed an issue. Then @vstinnerVictor Stinner 🐍 wrote a patch and opened a PR two hours later, which I reviewed and merged. Now:

screenshot of Python console with the code:

d = {}
key = [1, 2, 2]
d[key] = 123

producing the error message:

TypeError: cannot use 'list' as a dict key (unhashable type: 'list')
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