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  

Answer 2

UPDATE:

Please see the solution lower in this thread by Pedro Werneck instead of this one. It's the correct way to solve the problem.

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Preface: I do not recommend this!

This seems to work, but I have no idea what the consequences could be. This is cargo cult programming at its best! I'm only adding it here in case it can help someone in a bind.

I made changes to the file requirements.py where the error occurred. For @hysg, that would be this file:

/usr/lib/python2.7/site-packages/packaging/requirements.py 

On me on OS X, it's here:

/Library/Python/2.7/site-packages/packaging/requirements.py 

I modified the the offending line by removing the parentheses for the call to MARKER_EXPR, as demonstrated below:

#MARKER_EXPR = originalTextFor(MARKER_EXPR())("marker") MARKER_EXPR = originalTextFor(MARKER_EXPR)("marker") 

And that worked.

Again, please be careful! I don't know what I'm doing and this could potentially cause more harm than good.