字符串的所有字符都属于一个集合吗？

Question

Is there a straightforward way of finding whether all characters of a string belong to a given set of characters? I have the following looping code that I feel can be shortened:

def allInSet(mystr, myset):
    result = True
    for char in mystr:
        result &= (char in myset)
    return result

Examples:

>>> allInSet("yyyow", set(['a','e','i','o','u','w','y']))
True
>>> allInSet("yowza", set(['a','e','i','o','u','w','y']))
False

also, list(mystr) in set(['a','b','c']) did not work.

Answer 1

>>> set("aeiou").issuperset("hello world")
False
>>> set("aeiou").issuperset("eoo")
True