[Distutils] PyPi’s predictable download url

[Aleks Bunin]

Hello,

 I’m writing installation instructions for a package and have a question:
what is the correct predictable URL for the package? I found couple. Which
one of these guaranteed won’t change again in the future?

   -
   https://pypi.python.org/packages/source/v/virtualenv/virtualenv-15.1.0.tar.gz
   (used to work in the past, but doesn’t seem to work now, copied
from virtualenv’s
   docs <https://virtualenv.pypa.io/en/latest/installation/>)
   - https://pypi.io/packages/source/v/virtualenv/virtualenv-15.1.0.tar.gz
   - https://pypi.org/packages/source/v/virtualenv/virtualenv-15.1.0.tar.gz
   -
   https://files.pythonhosted.org/packages/source/v/virtualenv/virtualenv-15.1.0.tar.gz

 Is there a predictable URL, which will return latest version of the
package?

Thank you.

—
 Regards,
  *Aleks* *Bunin*

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