Anders Kaseorg <ande...@mit.edu> added the comment:
There are some problems that ‘=’ can’t solve, such as options with nargs ≥ 2.
optparse has no trouble with this:
>>> parser = optparse.OptionParser()
>>> parser.add_option('-a', nargs=2)
>>> parser.parse_args(['-a', '-first', '-second'])
(<Values at 0x7fc97a93a7e8: {'a': ('-first', '-second')}>, [])
But inputting those arguments is _not possible_ with argparse.
>>> parser = argparse.ArgumentParser()
>>> parser.add_argument('-a', nargs=2)
>>> parser.parse_args(['-a', '-first', '-second'])
usage: [-h] [-a A A]
: error: argument -a: expected 2 argument(s)
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue9334>
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