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[doc] Reword sentinel object summary in dataclasses (GH-27792) 

This sentinel value (`MISSING`) is also used as default value for the `kw_only` parameter introduced in Python 3.10. It's cleaner to simply omit the usage here.

Co-authored-by: Łukasz Langa <lukasz@langa.pl>
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Ville Korhonen 2021-09-02 16:03:22 +00:00 committed by GitHub
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Doc/library/dataclasses.rst
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@ -221,10 +221,9 @@ Module contents
c.mylist += [1, 2, 3]
As shown above, the :const:`MISSING` value is a sentinel object used to
detect if the ``default`` and ``default_factory`` parameters are
provided. This sentinel is used because ``None`` is a valid value
for ``default``. No code should directly use the :const:`MISSING`
value.
detect if some parameters are provided by the user. This sentinel is
used because ``None`` is a valid value for some parameters with
a distinct meaning. No code should directly use the :const:`MISSING` value.
The parameters to :func:`field` are: