[issue38843] Document argparse behaviour when custom namespace object already has the field set

[Raymond Hettinger]

Raymond Hettinger <raymond.hettinger at gmail.com> added the comment:


New changeset 752cdf21eb2be0a26ea6a34a0de33a458459aead by Raymond Hettinger in branch 'master':
bpo-38843: Document behavior of default when the attribute is already set (GH-23653)
https://github.com/python/cpython/commit/752cdf21eb2be0a26ea6a34a0de33a458459aead


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<https://bugs.python.org/issue38843>
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