documenting constants in python code example

Example 1: how to define a constant in python

You can't define a constant in Python unlike in other language, hence you can 
just make the variable all CAPS and add a comment using '#' saying that this is 
a constant variable.

Example 2: python constant

class CONST(object):
    __slots__ = ()
    FOO = 1234


CONST = CONST()

print(CONST.FOO)  # 1234

CONST.FOO = 4321  # AttributeError: 'CONST' object attribute 'FOO' is read-only
CONST.BAR = 5678  # AttributeError: 'CONST' object has no attribute 'BAR'

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