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If someone ports his code from optparse to argparse, there is a limit, that options and non-options can be mixed by default, and this behaviour cannot be disabled easily, an extra '--' argument is required in the command line.
In some cases it is much prettier to explicitly disable this, as was available in the deprecated optparse module.
I attach a patch that does this, adds disable_interspersed_args() to argparse.ArgumentParser.