问题
I tried upgrade pip3 with this command:
sudo pip3 install --upgrade pip
but unfortunately it doesn't work anymore and shows this message:
pip3 --version
message:
Traceback (most recent call last):
File "/usr/local/lib/python3.4/dist-packages/pkg_resources/init.py", line 651, in _build_master ws.require(requires)
File "/usr/local/lib/python3.4/dist-packages/pkg_resources/init.py", line 952, in require needed = self.resolve(parse_requirements(requirements))
File "/usr/local/lib/python3.4/dist-packages/pkg_resources/init.py", line 844, in resolve raise VersionConflict(dist, req).with_context(dependent_req) pkg_resources.VersionConflict: (pip 7.1.2 (/usr/local/lib/python3.4/dist-packages), Requirement.parse('pip==1.5.6'))During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/usr/local/bin/pip3", line 5, in from pkg_resources import load_entry_point
File "/usr/local/lib/python3.4/dist-packages/pkg_resources/init.py", line 3084, in @_call_aside
File "/usr/local/lib/python3.4/dist-packages/pkg_resources/init.py", line 3070, in _call_aside f(*args, **kwargs)
File "/usr/local/lib/python3.4/dist-packages/pkg_resources/init.py", line 3097, in _initialize_master_working_set working_set = WorkingSet._build_master()
File "/usr/local/lib/python3.4/dist-packages/pkg_resources/init.py", line 653, in _build_master return cls._build_from_requirements(requires)
File "/usr/local/lib/python3.4/dist-packages/pkg_resources/init.py", line 666, in _build_from_requirements dists = ws.resolve(reqs, Environment())
File "/usr/local/lib/python3.4/dist-packages/pkg_resources/init.py", line 839, in resolve raise DistributionNotFound(req, requirers) pkg_resources.DistributionNotFound: The 'pip==1.5.6' distribution was not found and is required by the application
How to fix it?
回答1:
It seems like you don't use virtualenv and your pythons/paths are probably messed up.
I faced with similar problem with python-2.7 and -3.4 on Ubuntu 14.04. I tried
sudo python -m pip install --upgrade --force-reinstall pip
for 2.7 and it helped. Then I reinstalled pip for python-3.4 via easy_install3.
来源：https://stackoverflow.com/questions/32565303/python-pip-is-not-working-after-upgrade