How to check all versions of python installed on osx and centos
Find out which version of Python is installed by issuing the command python --version: $ python --version Python 2.7.10
If you see something like this, Python 2.7 is your default version. You can also see if you have Python 3 installed:
$ python3 --versionPython 3.7.2
If you also want to know the path where it is installed, you can issue the command "which" with python and python3:
$ which python/usr/bin/python$ which python3/usr/local/bin/python3