Python old boy day09

Interpreter path
#!/usr/bin/env python

Python2 need, Python3 no longer needed.

The usage of input, waits forever until the user enters a value, assigns the input value to a thing

Variable name
-Alphabet
-Digital
-Underline
Ps:
Number cannot start
cannot be a keyword
It's best not to repeat the python built-in stuff.

Conditional statements
Indent with 4 spaces

Pass generation means empty code, meaningless, just to represent a block of code

Python old boy day09