python 2.7 - pip is error,TypeError: __call__() takes exactly 2 arguments (1 given)

Question

system

• centos 7.2
• Python 2.7.5

install

I install webhook

pip install webhook
### but hava error,then
yum install python-devel -y
## go on,pip doesn't workding
pip

error

Enter the command contain pip.Then

[root@location src]# pip
Traceback (most recent call last):
File "/usr/bin/pip", line 5, in <module>
from pkg_resources import load_entry_point
File "/usr/lib/python2.7/site-packages/pkg_resources/__init__.py", line 72, in <module>
import packaging.requirements
File "/usr/lib/python2.7/site-packages/packaging/requirements.py", line 59, in <module>
MARKER_EXPR = originalTextFor(MARKER_EXPR())("marker")
TypeError: __call__() takes exactly 2 arguments (1 given)

So,what should I do?!

Answer 1

I had the same problem on a fresh virtualenv and apparently this is a conflict between the version requirements for packaging, pip and pyparsing with the new setuptools. What worked for me was to pin down the old one.

pip install setuptools==33.1.1

Update:

As another answer pointed out, pip has already fixed the bug, so you should try upgrading it instead of using the workaround above.

python -m pip install --upgrade --force pip