Comment 5 for bug 1557434

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Gavin Panella (allenap) wrote : Re: CLI version command doesn't work (2.0)

I've figured out the problem here.

In development, a version of argparse from PyPI is installed by zc.buildout: testtools requires unittest2 which requires argparse 1.1. Unfortunately argparse 1.1 on PyPI is substantially different to argparse 1.1 in the Python standard library. Sigh.

This means that this bug never manifests in development, only when installed, and when the command is incomplete, i.e. missing the "read" verb in the OP's case.