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In python/cpython#28420 the order of setting the default values on the Namespace object and processing the Actions was reversed. This means that in the `__call__` method of `_FlagAction` the `_flags` attribute has not yet been put on the namespace. This change makes `_FlagAction.__call__` forgiving if the `_flags` attribute does not exist (by creating it!).
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This was referenced Nov 17, 2021
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In python/cpython#28420 the order of setting the
default values on the Namespace object and processing the Actions was reversed. This means
that in the
__call__method of_FlagActionthe_flagsattribute has notyet been put on the namespace.
This change makes
_FlagAction.__call__forgiving if the_flagsattributedoes not exist (by creating it!).