Learning Python

[Byte]

>what makes you think that basic Python functions work in radically
different ways on different platforms ?

Assumption. Im also new to programing, so could do something stupid
like think a Windows path is a command/input/etc. (really, ive done
things like that before.)

Now, im running this on a terminal, but am acctually writing my scripts
in a text editor. How can I get a script to do a sum with the editor?
e.g. it asks for a sum, then does it etc.