Python身份运算符

# 对于不同类型数据，is not 为真
num = 123
strs = 'hello'

# 输出 num 和 strs 的地址
print("num地址为:{0},strs地址为:{1}".format(id(num),id(strs)))
# num地址为:140729798131792,strs地址为:1692203499952
print(num is strs)
# False ,地址不同
print(num is not strs)
# True

# 对于不可变类型数据，引用自相同数据时，is 为真
# 数字
num = 123
num_two = 123
# 输出 num 和 num_two 的地址
print("num地址为:{0},num_two地址为:{1}".format(id(num),id(num_two)))
# num地址为:140729798131792,num_two地址为:140729798131792
print(num is num_two)
# True ,num 和 num_two 指向同一块内存地址
print(num is not num_two)
# False

# 字符串
strs = 'hello'
strs_two = 'hello'
# 输出 strs 和 strs_two 的地址
print("strs地址为:{0},strs_two地址为:{1}".format(id(strs),id(strs_two)))
# strs地址为:1248715293104,strs_two地址为:1248715293104
print(strs is strs_two)
# True
print(strs is not strs_two)
# False

# 元组
tup = (1,2,3)
tup_two = (1,2,3)
# 输出 tup 和 tup_two 的地址
print("tup地址为:{0},tup_two地址为:{1}".format(id(tup),id(tup_two)))
# tup地址为:2065334183480,tup_two地址为:2065334183480
print(tup is tup_two)
# True
print(tup is not tup_two)
# False



# 对于可变类型，即使引用自相同数据，内存地址也不相同。is not 为 True
# 列表
lst = [1,2,3]
lst_two = [1,2,3]
# 输出 lst 和 lst_two 的地址
print("lst地址为:{0},lst_two地址为:{1}".format(id(lst),id(lst_two)))
# lst地址为:2781811921480,lst_two地址为:2781811921992
print(lst is lst_two)
# False
print(lst is not lst_two)
# True

# 字典
dic = {'a':123,'b':456}
dic_two = {'a':123,'b':456}
# 输出 dic 和 dic_two 的地址
print("dic地址为:{0},dic_two地址为:{1}".format(id(dic),id(dic_two)))
# dic地址为:2871230999272,dic_two地址为:2871230999352
print(dic is dic_two)
# False
print(dic is not dic_two)
# True

# 集合
sets = {'a','b'}
sets_two = {'a','b'}
# 输出 sets 和 sets_two 的地址
print("sets地址为:{0},sets_two地址为:{1}".format(id(sets),id(sets_two)))
# sets地址为:2089152127048,sets_two地址为:2089152127720
print(sets is sets_two)
# False
print(sets is not sets_two)
# True