Check if a string contains only given characters

Question

I\'m wondering if there is more elegant way to check if the string (str = \'abcccbbaabcbca\') contains only \'a\',\'b\' or \'c\' than iterating over it :

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Answer 1

You could use any with a generator expression:

if any(c not in 'abc' for c in _str):  # Don't use str as a name.
    print('Wrong character')