python类contains()的实例源码

def like(a, b):
    return operator.contains(a.lower(), b.lower())

def test_operator(self):
        import operator
        self.assertIs(operator.truth(0), False)
        self.assertIs(operator.truth(1), True)
        self.assertIs(operator.not_(1), False)
        self.assertIs(operator.not_(0), True)
        self.assertIs(operator.contains([], 1), False)
        self.assertIs(operator.contains([1], 1), True)
        self.assertIs(operator.lt(0, 0), False)
        self.assertIs(operator.lt(0, 1), True)
        self.assertIs(operator.is_(True, True), True)
        self.assertIs(operator.is_(True, False), False)
        self.assertIs(operator.is_not(True, True), False)
        self.assertIs(operator.is_not(True, False), True)

def _op_compare(self, args, op):
        """Returns True if the specified operator can successfully
        compare the first item in the args with all the rest. Will
        return False if only one item is in the list.
        """
        if len(args) < 2:
            return False
        if op is operator.contains:
            bad = args[0] not in args[1:]
        else:
            bad = [arg for arg in args[1:]
                    if not op(args[0], arg)]
        return not bool(bad)

def _in(self, args):
        """First term is in set of remaining terms."""
        return self._op_compare(args, operator.contains)

def in_(x, y):
    return operator.contains(y, x)

def not_in(x, y):
    return not operator.contains(y, x)

def chained_contains(chained, id, contains=op.contains):
    stores_with_read = [s for s in chained.stores if s._read]
    if len(stores_with_read) == 0:
        raise PermissionError('contains', chained, 'read')

    for store in stores_with_read:
        if store._read and contains(store, id):
            return True
    return False