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My console:
desarrollador@desarrollador-HP-14-Notebook-PC1:~$ pip freeze Exception: Traceback (most recent call last): File "/usr/lib/python2.7/dist-packages/pip/basecommand.py", line 126, in main self.run(options, args) File "/usr/lib/python2.7/dist-packages/pip/commands/freeze.py", line 68, in run req = pip.FrozenRequirement.from_dist(dist, dependency_links, find_tags=find_tags) File "/usr/lib/python2.7/dist-packages/pip/__init__.py", line 156, in from_dist assert len(specs) == 1 and specs[0][0] == '==' AssertionError I installed the tornado package and this happened since. How can I fix it?
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Since pip freeze shows all dependencies as a flat list, finding out which are the top level packages and which packages do they depend on requires some effort. It's also tedious to resolve conflicting dependencies that could have been installed because older version of pip didn't have true dependency resolution [1].
pip freeze is a very useful command, because it tells you which modules you've installed with pip install and the versions of these modules that you are currently have installed on your computer. In Python, there's a lot of things that may be incompatible, such as certain modules being incompatible with other modules.
Therefore, you should use pip list and pip freeze as follows: If you want to check a list of packages with various conditions, use pip list . If you want to create requirements. txt , use pip freeze .
This worked for me (running Ubuntu, both 12 and 14 LTS):
pip install -U setuptools pip install -U pip Upgrade to the latest version of setuptools in order to be able to upgrade to the latest version of pip, and upgrade to the latest version of pip to get a version that has fixed the AssertException error.
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