CODEWITHSUNDEEP
pythonpython-2.7python-3.xpip
fluency03
fluency03

Reputation: 2697

pip3 list comes AssertionError

when I do pip3 list in the terminal, it comes the following error:

cliu@cliu-ubuntu:~$ pip3 list
Exception:
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/pip/basecommand.py", line 122, in main
    status = self.run(options, args)
  File "/usr/lib/python3/dist-packages/pip/commands/list.py", line 80, in run
    self.run_listing(options)
  File "/usr/lib/python3/dist-packages/pip/commands/list.py", line 142, in run_listing
    self.output_package_listing(installed_packages)
  File "/usr/lib/python3/dist-packages/pip/commands/list.py", line 151, in output_package_listing
    if dist_is_editable(dist):
  File "/usr/lib/python3/dist-packages/pip/util.py", line 367, in dist_is_editable
    req = FrozenRequirement.from_dist(dist, [])
  File "/usr/lib/python3/dist-packages/pip/__init__.py", line 299, in from_dist
    assert len(specs) == 1 and specs[0][0] == '=='
AssertionError

Storing debug log for failure in /home/cliu/.pip/pip.log

Anyone knows how to fix this?

Upvotes: 9

Views: 3335

Answers (4)

Ravi Teja
Ravi Teja

Reputation: 207

Though there is an accepted answer here, that did not work for me. So, my answer might help others who face the same issue. This bug was fixed with a single line commit here.

https://github.com/pypa/pip/commit/6cab71f422f2425b4d2283023c9e955f9663dde6

The solution is to change the line from 

assert len(specs) == 1 and specs[0][0] == '=='

to 

assert len(specs) == 1 and specs[0][0] in ["==", "==="]

The line number varies from version to version but, the debug message should make it easier to find. In your case it is line 299, in the file "/usr/lib/python3/dist-packages/pip/__init__.py"

Upvotes: 2

Julian Irwin
Julian Irwin

Reputation: 302

I fixed this problem by commenting out the problematic assert statement:

# assert len(specs) == 1 and specs[0][0] == '=='

This is definitely not an ideal solution, as that statement is probably there for a good reason, but pip3 list now works, as do all the other parts of pip3 that I use.

Upvotes: 0

Ashtar Sheran
Ashtar Sheran

Reputation: 11

Strange, I have had the same problem, but the first solution didn't work for me(I was getting the same error after purging it over again and over again). So I have decided to edit the the line.

assert len(specs) == 1 and specs[0][0] == '=='

And removed:

 == '=='

Funny, but it works now.

Upvotes: 0

Kevin
Kevin

Reputation: 30151

Judging by the bug linked in the comments, this can be fixed by upgrading to the latest Pip. Since doing that within Ubuntu/Debian's packaging system is moderately nontrivial, I think it would probably be simpler to just install a new version of Pip into a Virtualenv. Once you've created the virtualenv, you can upgrade to the latest Pip with this command:

pip install --upgrade pip

Upvotes: 4

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