What are the requirements for naming python modules?

Question

I\'ve been going through Learn Python The Hard Way as a sort of refresher. Instead of naming each example ex#.py (where # is the number of the exercise), however, I\'ve just

Answer 1

The explicit rules for what is allowed to be a valid identifier (variable, module name etc.) can be found here: https://docs.python.org/dev/reference/lexical_analysis.html#identifiers

In your case, this is the relevant sentence:

Within the ASCII range (U+0001..U+007F), the valid characters for identifiers are the same as in Python 2.x: the uppercase and lowercase letters A through Z, the underscore _ and, except for the first character, the digits 0 through 9.