[Python-Dev] Dependent packages not listed on PyPI

[Brett Cannon]

Questions about PyPI should be directed at the distutils-sig mailing list.

On Tue, 19 Apr 2016 at 08:12 Andreas Maier <andreas.r.maier at gmx.de> wrote:

> Hi,
> I have a package "pywbem" which in its setup script specifies a number of
> dependent packages via "install_requires".
>
> I should also say that it extends setuptools/distutils with its own
> additional keywords, e.g. it adds a "develop_requires", but I believe
> (hope) that is irrelevant for my problem.
>
> In pywbem 0.8.3, the dependencies are:
>
>     args = {
>         ...,
>         'install_requires': [
>             'six',
>             'ply',
>         ],
>         ...,
>     }
>
> and when running on Python 2.x, an additional one is added, dependent on
> the OS platform and bit size:
>
>     if sys.version_info[0] == 2:
>         if platform.system() == 'Windows':
>             if platform.architecture()[0] == '64bit':
>                 m2crypto_req = 'M2CryptoWin64>=0.21'
>             else:
>                 m2crypto_req = 'M2CryptoWin32>=0.21'
>         else:
>             m2crypto_req = 'M2Crypto>=0.24'
>         args['install_requires'] += [
>             m2crypto_req,
>         ]
>
> The problem is that the pywbem package on PyPI does not show these
> dependencies: https://pypi.python.org/pypi/pywbem/0.8.3
>
> I wonder whether this is the reason for a particular installation problem
> we have seen (https://github.com/pywbem/pywbem/issues/113).
>
> I do see other projects on PyPI, that show the dependencies they specify
> in their setup scripts, on their PyPI package page in a "*Requires
> Distributions*" section:
>
> * https://pypi.python.org/pypi/bandit/0.17.3
> * https://pypi.python.org/pypi/json-spec/0.9.14
>
> Many others also do not have their dependencies shown, including six, pbr,
> PyYAML, lxml, to name just a few.
>
> So far, I was unable to find out what the presence or absence of that
> information is related to, in the source of the project.
>
> Here are my questions:
>
> 1. What causes the "Requires Distributions" section on a PyPI package
> page to show up there?
>
> 2. Is it important to show up there (e.g. for some tools)?
>
> Andy
>
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