Usually here:
/usr/local/lib/<python version>/site-packages
Or
pip show request <package name>
More flesh, less fluff.
Usually here:
/usr/local/lib/<python version>/site-packages
Or
pip show request <package name>
Create a virtual environment:
$ python3 -m venv myenv
Activate it:
$ source myenv/bin/activate
[myenv] $
Leave/Deactivate it:
[myenv] $ deactivate
$