Wolfgang Maier <wolfgang.ma...@biologie.uni-freiburg.de> added the comment:

_wants_ is a bit a strong word, but, at least, you can do a bit a nicer job 
than the default error, like printing a nicely formatted list of subcommands as 
you would get it with the main parsers help.
In fact, in my own code I'm actually catching the missing subparser situation, 
then calling parse_args again with ['--help'] :)

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<https://bugs.python.org/issue33109>
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