[issue15906] argparse add_argument() confusing behavior when type=str, default=

[Barry A. Warsaw]

Barry A. Warsaw added the comment:

Oops, one small correction for 15906-3.diff: In Python 2.7, s/str/basestring/

Obviously isinstance should just check for str-y-ness in Python 3.{2,3}

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<http://bugs.python.org/issue15906>
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