Éric Araujo added the comment:
requires is supposed to take a Python module name (e.g. 'xml'), not a
distribution name (e.g. 'PyXML') or a system package name ('rpm-build'). The
hyphen is rejected because it’s not a valid character for a Python module name.
That said, requires should not be used, as there is no tool at all that
supports it. distutils effectively has no support for dependencies. I have a
bug open to recommend to people that they shouldn’t use requires. Third-party
tools support dependencies on Python distributions, i.e. names like PyXML which
are registered on PyPI.
There is no way to depend on non-Python stuff for the moment with distutils. A
custom command could call the system package manager, or users need to install
it manually, or you can use buildout, or a configuration management system like
puppet or chef.
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<http://bugs.python.org/issue17509>
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