http://legacy.python.org/dev/peps/pep-0008/#naming-conventions
For classes please use capitalisation as a separator (CapWords convention)
MyClass
Function names should be lowercase, with words separated by underscores as
necessary to improve readability.
my_function_that_does_awesome_things()
my_var
__my_private_var
Please avoid to use built-in function names as variable names
(https://docs.python.org/2/library/functions.html).
Frequent examples are file and bin.
Constants are usually defined on a module level and written in all capital letters with underscores separating words.
Examples include MAX_OVERFLOW and TOTAL.