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python -V
or
python --version

Python 3.3.2

Python 3.3.2 (v3.3.2:d047928ae3f6, May 16 2013, 00:03:43) [MSC v.1600 32 bit (Intel)] on win32
Type "copyright", "credits" or "license()" for more information.
>>>

#!/usr/bin/python3

print("Hello, World!")

$ python3 hello.py

Hello, World!