[Python-Dev] Dependent packages not listed on PyPI (original) (raw)

Andreas Maier andreas.r.maier at gmx.de
Tue Apr 19 07:38:48 EDT 2016

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:

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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