Problem concerning pip

[Alexandre Vieira]

The installation of shtns through pip seems broken. Launching pip install shtns resulted in an error after several trials, with the same message:

Requested shtns from [long link] has inconsistent version: filename has '3.6.6', but metadata has '0.0.0'

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[Nathanaël Schaeffer]

Yes, this problem appears on some systems but not all. I have not yet understand what is causing it. It seems to be a problem with older version of pip that are not happy with the version only defined in pyproject.toml and not in setup.py
I will try to add back the version in setup.py, but I need to find a way to define it only once to avoid inconsistencies.