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Today, I read the argparse doc and find the Mutual exclusion
section(<a
href="http://docs.python.org/2/library/argparse.html#mutual-exclusion">http://docs.python.org/2/library/argparse.html#mutual-exclusion</a>)
has a problem<br>
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The function `<b>add_mutually_exclusive_group</b>' in the section is
:<br>
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<font color="#ff0000"><b>argparse.add_mutually_exclusive_group(required=False)</b></font><br>
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but add_mutually_exclusive_group belongs to <b>ArgumentParser</b>
object, not direct to <b>argparse</b>, maybe this is a bug?<br>
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