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PEP 635: Note use of ? in IPython/Jupyter

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Guido van Rossum 2020-10-19 17:20:56 -07:00
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@ -801,6 +801,10 @@ chaining" in TypeScript (the latter meaning has also been proposed for
Python by PEP 505). An as yet unnamed PEP proposes it to mark
optional types, e.g. ``int?``.
Another common use of ``?`` in programming systems is "help", for
example, in IPython and Jupyter Notebooks and many interactive
command-line utilities.
In addition, this would put Python in a rather unique position:
The underscore is as a wildcard pattern in *every*
programming language with pattern matching that we could find