paul j3 added the comment:
Since parse_args takes an optional Namespace argument, you can set the its
initial value to almost anything. For example, with the functions defined
previously:
parser = argparse.ArgumentParser()
parser.add_argument('-a','--algorithm', choices=['Q','S'],
action=FooAction, type=bar)
NS = parser.parse_args(['-a','S'])
args = parser.parse_args(None, NS)
The first parse_args uses FooAction to create a default Namespace, which is
then passed to the second.
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<http://bugs.python.org/issue18467>
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