How to list all installed packages and their versions in Python?

Question

Is there a way in Python to list all installed packages and their versions?

I know I can go inside python/Lib/site-packages and see what files and direc

Answer 1

from command line

python -c help('modules')

can be used to view all modules, and for specific modules

python -c help('os')

For Linux below will work

python -c "help('os')"