If you want to findout your current python version from terminal, then you can use below commands.
Python2
· ~ $ python --version
Python 2.7.18 :: Anaconda, Inc.
If you want to find out using code, you can use below snippet.
import sys
print sys.version_info
print sys.version
Python3
· ~ $ python --version
Python 3.7.4
Similarly for Python3 you can use below snippet,
import sys
print(sys.version_info)
print(sys.version)