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GH-87358: Add clarification about nargs and default argparse behaviour #124094

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Merged
merged 5 commits into from
Sep 24, 2024
Merged

GH-87358: Add clarification about nargs and default argparse behaviour #124094

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cb2e693
add clarification about nargs and default
savannahostrowski Sep 14, 2024
16c45cd
fix trailing whitespace
savannahostrowski Sep 14, 2024
770b732
update phrasing for clarity
savannahostrowski Sep 22, 2024
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appease linter
savannahostrowski Sep 22, 2024
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Merge branch 'main' into gh-87358
savannahostrowski Sep 24, 2024
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3 changes: 3 additions & 0 deletions Doc/library/argparse.rst
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Expand Up @@ -1122,6 +1122,9 @@ is used when no command-line argument was present::
>>> parser.parse_args([])
Namespace(foo=42)

For required_ arguments, the ``default`` value is ignored. For example, this
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Aside: we have a (somewhat unusual) convention of using italics for arguments instead of literal code formatting:

https://devguide.python.org/documentation/markup/

But I see we're using literals elsewhere in this file so it's best to be consistent.

applies to positional arguments with nargs_ values other than ``?`` or ``*``,
or optional arguments marked as ``required=True``.

Providing ``default=argparse.SUPPRESS`` causes no attribute to be added if the
command-line argument was not present::
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