Python: Check if string is in list otherwise throw error

Question

I would like to check if a string s is in a given list valid_string. If not, I want to throw an error.

valid_string = ['abc', 'def', 'ghi']
s = 'test'
if s not in valid_string:
# Throw error: ('"{}" is not a valid string. Valid strings are {}'.format(s, valid_string))

What's best practice in order to throw the error?

Answer 1

You can try using Manual Exception as follows:

valid_string = ['abc', 'def', 'ghi']
s = 'test'
if s not in valid_string:
    raise Exception('This is the exception you expect to handle')