I have a mac, when I do:
python --version
I got:
Python 2.7.6
but when I got to:
/System
If you have both Python2 and Python3 installed on your Mac, you can use
python --version
to check the version of Python2, and
python3 --version
to check the version of Python3.
However, if only Python3 is installed, then your system might use python instead of python3 for Python3. In this case, you can just use
python --version
to check the version of Python3.