sets.py 文件源码

def issuperset(self, other):
        """Report whether this set contains another set."""
        self._binary_sanity_check(other)
        if len(self) < len(other):  # Fast check for obvious cases
            return False
        for elt in ifilterfalse(self._data.__contains__, other):
            return False
        return True

    # Inequality comparisons using the is-subset relation.