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

diff --git a/Doc/library/argparse.rst b/Doc/library/argparse.rst
index f22aeb8c13c605369caaac24ccf104ee2fbd01d5..53ecc97d5659f4382f6c88806c1a3a36c71c884e 100644 (file)
--- a/Doc/library/argparse.rst
+++ b/Doc/library/argparse.rst
@@ -1123,6 +1123,9 @@ 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
+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::