What Is the Easiest Way to Remove All Packages Installed by Pip

What is the easiest way to remove all packages installed by pip?

I've found this snippet as an alternative solution. It's a more graceful removal of libraries than remaking the virtualenv:

pip freeze | xargs pip uninstall -y

In case you have packages installed via VCS, you need to exclude those lines and remove the packages manually (elevated from the comments below):

pip freeze | grep -v "^-e" | xargs pip uninstall -y

The following command should do the trick:

pip freeze > requirements.txt && pip uninstall -r requirements.txt -y

Alternatively you can skip the creation of any intermediate files (i.e. requirements.txt):

pip uninstall -y -r <(pip freeze)

Having tested this using Python 3.5 and pip 7.1.2 on Linux, the situation appears to be this:

pip install --user somepackage installs to $HOME/.local, and uninstalling it does work using pip uninstall somepackage.
This is true whether or not somepackage is also installed system-wide at the same time.
If the package is installed at both places, only the local one will be uninstalled. To uninstall the package system-wide using pip, first uninstall it locally, then run the same uninstall command again, with root privileges.
In addition to the predefined user install directory, pip install --target somedir somepackage will install the package into somedir. There is no way to uninstall a package from such a place using pip. (But there is a somewhat old unmerged pull request on Github that implements pip uninstall --target.)
Since the only places pip will ever uninstall from are system-wide and predefined user-local, you need to run pip uninstall as the respective user to uninstall from a given user's local install directory.

I could remove everything like this:
To get room permissions:

sudo su

and then removed anything on this location:

/usr/local/lib/python3.9/site-packages/

You can run this in command prompt(no adminstrator priveleges) prompt:

pip freeze > packagelist.txt
pip uninstall -r .\packagelist.txt -y

Another more programmatic way would be :

$packages = pip freeze 

foreach ($package in $packages ){
pip uninstall $package -y

}

both work the same but the first example creates a .txt file, you may want to delete that