pip version
21.0.1
Python version
3.6.8
OS
Windows 10
Additional information
$ python -VV
Python 3.6.8 (tags/v3.6.8:3c6b436a57, Dec 24 2018, 00:16:47) [MSC v.1916 64 bit (AMD64)]
Description
When using multiple ~= version specifiers that are compatible, pip fails with an error.
Expected behavior
pip should install one of the versions that satisfy both requirements.
How to Reproduce
- Make sure you have the latest numpy
$ pip freeze | grep numpy
numpy==1.19.5
- Install two overlapping version ranges that would require a downgrade:
pip install numpy~=1.18 numpy~=1.18.0
Output
$ pip install numpy~=1.18 numpy~=1.18.0
Looking in indexes: https://nexus-pypi-ci:****@nexus.devops.definiens.com/repository/pypi-all/simple
Requirement already satisfied: numpy~=1.18 in c:\users\kftf964\appdata\local\programs\python\python36\lib\site-packages (1.19.5)
ERROR: Exception:
Traceback (most recent call last):
File "c:\users\kftf964\appdata\local\programs\python\python36\lib\site-packages\pip\_internal\cli\base_command.py", line 189, in _main
status = self.run(options, args)
File "c:\users\kftf964\appdata\local\programs\python\python36\lib\site-packages\pip\_internal\cli\req_command.py", line 178, in wrapper
return func(self, options, args)
File "c:\users\kftf964\appdata\local\programs\python\python36\lib\site-packages\pip\_internal\commands\install.py", line 317, in run
reqs, check_supported_wheels=not options.target_dir
File "c:\users\kftf964\appdata\local\programs\python\python36\lib\site-packages\pip\_internal\resolution\resolvelib\resolver.py", line 122, in resolve
requirements, max_rounds=try_to_avoid_resolution_too_deep,
File "c:\users\kftf964\appdata\local\programs\python\python36\lib\site-packages\pip\_vendor\resolvelib\resolvers.py", line 453, in resolve
state = resolution.resolve(requirements, max_rounds=max_rounds)
File "c:\users\kftf964\appdata\local\programs\python\python36\lib\site-packages\pip\_vendor\resolvelib\resolvers.py", line 347, in resolve
failure_causes = self._attempt_to_pin_criterion(name, criterion)
File "c:\users\kftf964\appdata\local\programs\python\python36\lib\site-packages\pip\_vendor\resolvelib\resolvers.py", line 221, in _attempt_to_pin_criterion
raise InconsistentCandidate(candidate, criterion)
pip._vendor.resolvelib.resolvers.InconsistentCandidate: Provided candidate AlreadyInstalledCandidate(numpy 1.19.5 (c:\users\kftf964\appdata\local\programs\python\python36\lib\site-packages)) does not satisfy SpecifierRequirement('numpy~=1.18'), SpecifierRequirement('numpy~=1.18.0')Code of Conduct
We found this problem in a pretty complex internal dependency tree. It's reproducible with a simple numpy install though.
I'd be very happy about a fix! For now, we work around this by explicitly stating version ranges, e.g. >=4.1,<5.
pip version
21.0.1
Python version
3.6.8
OS
Windows 10
Additional information
$ python -VV
Python 3.6.8 (tags/v3.6.8:3c6b436a57, Dec 24 2018, 00:16:47) [MSC v.1916 64 bit (AMD64)]
Description
When using multiple
~=version specifiers that are compatible, pip fails with an error.Expected behavior
pip should install one of the versions that satisfy both requirements.
How to Reproduce
Output
Code of Conduct
We found this problem in a pretty complex internal dependency tree. It's reproducible with a simple numpy install though.
I'd be very happy about a fix! For now, we work around this by explicitly stating version ranges, e.g.
>=4.1,<5.