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#12776,#11839: call argparse type function only once.

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Before, the type function was called twice in the case where the default
was specified and the argument was given as well.  This was especially
problematic for the FileType type, as a default file would always be
opened, even if a file argument was specified on the command line.

Patch by Arnaud Fontaine, with additional test by Mike Meyer.
This commit is contained in:
R David Murray 2012-08-31 23:15:28 -04:00
parent cd366620a9
commit 201018718f
4 changed files with 69 additions and 7 deletions
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21
Lib/argparse.py
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@ -1705,10 +1705,7 @@ class ArgumentParser(_AttributeHolder, _ActionsContainer):
if action.dest is not SUPPRESS:
if not hasattr(namespace, action.dest):
if action.default is not SUPPRESS:
default = action.default
if isinstance(action.default, basestring):
default = self._get_value(action, default)
setattr(namespace, action.dest, default)
setattr(namespace, action.dest, action.default)
# add any parser defaults that aren't present
for dest in self._defaults:
@ -1936,12 +1933,22 @@ class ArgumentParser(_AttributeHolder, _ActionsContainer):
if positionals:
self.error(_('too few arguments'))
# make sure all required actions were present
# make sure all required actions were present, and convert defaults.
for action in self._actions:
if action.required:
if action not in seen_actions:
if action not in seen_actions:
if action.required:
name = _get_action_name(action)
self.error(_('argument %s is required') % name)
else:
# Convert action default now instead of doing it before
# parsing arguments to avoid calling convert functions
# twice (which may fail) if the argument was given, but
# only if it was defined already in the namespace
if (action.default is not None and
hasattr(namespace, action.dest) and
action.default is getattr(namespace, action.dest)):
setattr(namespace, action.dest,
self._get_value(action, action.default))
# make sure all required groups had one option present
for group in self._mutually_exclusive_groups: