None

0 值的整型 / 浮点型、空字符串('')、空列表([])、 空元组((,))、空字典({})、空集合(set())都等价于 False,但是不等于 None

thing = None
if thing:
    print("It's some thing")
else:
    print("It's no thing")

if thing is None:
    print("It's no thing")
else:
    print("It's some thing")