New versions of pip break setup.py

[polyatail]

This is the behavior in pip==18.1 and is I believe what setup.py expects:

>>> from pip._internal.req import parse_requirements
>>> foo = listparse_requirements("requirements.txt", session=False))
>>> foo[0].req
<Requirement('Flask-Cors==3.0.7')>

This is the behavior in pip==20.1:

>>> from pip._internal.req import parse_requirements
>>> foo = list(parse_requirements("requirements.txt", session=False))
>>> foo[0].req
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'ParsedRequirement' object has no attribute 'req'
>>> foo[0].requirement
'Flask-Cors==3.0.7'

[polyatail]

I think generally speaking it's a good idea to avoid internals of other packages since the maintainers tend to break stuff without telling anyone and not feel bad about it.

[thomaxxl]

Thanks, I didn't notice.