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Language/Type: Python boolean logic return string

Write a function named is_all_vowels that returns whether a string consists entirely of vowels (a, e, i, o, or u, case-insensitively). If every character of the string is a vowel, your function should return True. If any character of the string is a non-vowel, your function should return False. Your function should return True if passed the empty string, since it does not contain any non-vowel characters.

For example, here are some calls to your function and their expected results:

Call Value Returned
is_all_vowels("eIEiO") True
is_all_vowels("oink") False
Function: Write a Python function as described, not a complete program.

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