[issue12776] argparse: type conversion function should be called only once

[Arnaud Fontaine]

Changes by Arnaud Fontaine <arnau at debian.org>:


Added file: http://bugs.python.org/file23775/py2.7-argparse-call-type-function-once-v3.patch

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue12776>
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