That way you haven't installed pip, you installed just the easy_install i.e. setuptools.

First you should remove all the packages you installed with easy_install using (see uninstall):

Copyeasy_install -m PackageName

This includes pip if you installed it using easy_install pip.

After this you remove the setuptools following the instructions from here:

If setuptools package is found in your global site-packages directory, you may safely remove the following file/directory:

Copysetuptools-*.egg

If setuptools is installed in some other location such as the user site directory (eg: ~/.local, ~/Library/Python or %APPDATA%), then you may safely remove the following files:

Copypkg_resources.py
easy_install.py
setuptools/
setuptools-*.egg-info/

Pip currently ignores uninstall commands that try to uninstall something owned by the OS. It doesn't error out, like it does with a missing package. So, now you can uninstall with the following process:

pip freeze > dump.txt

Edit the dumped file to remove any -e "editable install" lines, everything after the == sign (%s;==.*;;g in vim), swap the new lines for spaces (%s;\n; ;g in vim). Then you can uninstall all un-owned packages with

cat dump.txt | xargs sudo pip uninstall -y

I had to do this procedure twice, because a few packages were installed in ~/.local/lib too.

A one-liner to accomplish this:

pip freeze | grep -vP '^(?:#|-e\s)' | sed 's;==.*;;g' | xargs -r sudo pip uninstall -y

Be careful though, for those who using pip install --user some_pkg inside a virtual environment.

Copy$ path/to/python -m venv ~/my_py_venv
$ source ~/my_py_venv/bin/activate
(my_py_venv) $ pip install --user some_pkg
(my_py_venv) $ pip uninstall some_pkg
WARNING: Skipping some_pkg as it is not installed.
(my_py_venv) $ pip list
# Even `pip list` will not properly list the `some_pkg` in this case

In this case, you have to deactivate the current virtual environment, then use the corresponding python/pip executable to list or uninstall the user site packages:

Copy(my_py_venv) $ deactivate
$ path/to/python -m pip list
$ path/to/python -m pip uninstall some_pkg

Note that this issue was reported few years ago. And it seems that the current conclusion is: --user is not valid inside a virtual env's pip, since a user location doesn't really make sense for a virtual environment.

This will work for all Mac, Windows, and Linux systems. To get the list of all pip packages in the requirements.txt file (Note: This will overwrite requirements.txt if exist else will create the new one, also if you don't want to replace old requirements.txt then give different file name in the all following command in place requirements.txt).

Copypip freeze > requirements.txt

Now to remove one by one

Copypip uninstall -r requirements.txt

If we want to remove all at once then

Copypip uninstall -r requirements.txt -y

If you're working on an existing project that has a requirements.txt file and your environment has diverged, simply replace requirements.txt from the above examples with toberemoved.txt. Then, once you have gone through the steps above, you can use the requirements.txt to update your now clean environment.

And For single command without creating any file as @joeb suggested

Copypip uninstall -y -r <(pip freeze)