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python判断变量是否为None

2021-12-01 13:00:57 作者：互联网

name = None
print(name,type(name))
#判断变量是否 None 不能用type和isinstance
# print(isinstance(name,NoneType))
# print(type(name)==NoneType)
# print(isinstance(name,'NoneType'))
# print(type(name)=='NoneType')
#用is 判断 NoneType类型  不行
# print(type(name) is 'NoneType')
print(name is None)
print(name is not None)

标签：None,变量,python,print,isinstance,type,NoneType,name
来源： https://www.cnblogs.com/ljf520hj/p/15627619.html