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gh-133560: Clarified parser.md doc for pegen parser issue in using the existing Grammar/python.gram file. #139194

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gh-133560: Clarified parser.md doc for pegen parser issue in using the existing Grammar/python.gram file. #139194

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Clarified issue in using the existing Grammar/python.gram file.
chemelnucfin Sep 21, 2025
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Changed parser.md pegen note to using Caution note block in more appr…
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6 changes: 6 additions & 0 deletions InternalDocs/parser.md
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Expand Up @@ -819,6 +819,12 @@ directory on the CPython repository and manually call the parser generator by ex
$ python -m pegen python <PATH TO YOUR GRAMMAR FILE>
```

> [!CAUTION]
> This grammar file has to be specific to Python and does not work with the existing
> C language based `Grammar/python.gram` file.
> See [#133560](https://github.com/python/cpython/issues/133560)
> and [#96424](https://github.com/python/cpython/issues/96424) for more information.

This will generate a file called `parse.py` in the same directory that you
can use to parse some input:

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