Python (check example, please): is it correct to use for not in var? What can be an alternative to achieve same result?

Question

Example:
var = "abc"
for c not in var:
print (a)

Answer 1

It's an error... When you use not in, in a for loop... There's nothing to print...

Answer 2

First tell me, what the output should be?

Answer 3

Okay, solved. I wanted to get a text input from the user and to eliminate any character that was not a number from the text. So I have just introduced inside for loop an "if c not in" and I managed to get the result. Thank you!!

Answer 4

And is there any form to do it?