python 3.x - check if a string only contains certain letters -

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in python how create function checks see if user enter string contains letter , b? string can long user wants should contains combination of letters , b. thanks.

alternatively using regular expressions, use generator expression checking whether all characters in string "ab".

>>> all(c in "ab" c in "foobar") false >>> all(c in "ab" c in "aaabaababbba") true

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