GNU bug report logs - #71797
30.0.60; Face of variables and function parameters in Python

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From: Stephen Berman <stephen.berman@HIDDEN>
To: bug-gnu-emacs@HIDDEN
Subject: 30.0.60; Face of variables and function parameters in Python
Date: Thu, 27 Jun 2024 16:04:58 +0200
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0. emacs -Q, where Emacs has been built with treesitter support and the
   treesitter Python grammar library is installed.
1. Visit the attached file "test.py", which contains examples in Python
   of variables and function parameters with type hints.  The buffer is
   now in the default (non-treesitter) python-mode.
2. Notice that the initialized annotated variable `age' and the
   (unannotated) assigned to occurrences of `child' are fontified with
   font-lock-variable-name-face, while the uninitialized annotated
   variables `a' and `child' and the annotated function parameters
   `num', `num1' and `num2' are displayed in the default face.
3. M-x python-ts-mode.  Now the uninitialized `age', `a' and `child' as
   well as the function parameters `num', `num1' and `num2' are all
   fontified with font-lock-variable-name-face.

I don't know if this difference demonstrates a bug in python-mode or in
python-ts-mode, but I assume only one of them is right.  I note that in
much online Python documentation variables in assignments or function
parameters (with or without type hints) are mostly not fontified
(e.g. in Python's own documentation and in
https://mypy.readthedocs.io/en/stable/cheat_sheet_py3.html, which is
where the examples in the attached file come from).  On the other hand,
I note that python-ts-mode also fontifies function parameters that lack
type hints or default values with font-lock-variable-name-face (the
default python-mode does not).


In GNU Emacs 30.0.60 (build 3, x86_64-pc-linux-gnu, GTK+ Version
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Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

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