how to check if python is installed on linux code example

Example 1: check python version kali linux

$ python2 --version

Example 2: bash check if python package is installed

$ python2 -m doesnt_exist |& grep -q 'No module named' && echo 'Nope' || echo 'Yup'
Nope

$ python2 -m math |& grep -q 'No module named' && echo 'Nope' || echo 'Yup'
Yup