HelloWorld.py

$ python
Python 3.8.2 (tags/v3.8.2:7b3ab59, Feb 25 2020, 22:45:29) [MSC v.1916 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> print("hello world!")
hello world! 

# Now we can type any valid python expression at the prompt. python reads the typed expression, evaluates it and prints the result.

>>> 11
11
>>> 2 + 4
6