python-序列解包(对可迭代元素的快速取值方法)
一般情况下
x,y,z = 1,2,3
print("x:",x)
print("y:",y)
print("z:",z)
#运行结果 x: 1 y: 2 z: 3
对元祖序列解包
name = ("qiaobushi","wanglihong","leibushi")
x,y,z = name
print(name)
print("x:",x)
print("y:",y)
print("z:",z)
#运行结果
('qiaobushi', 'wanglihong', 'leibushi')
x: qiaobushi
y: wanglihong
z: leibushi
对列表序列解包
str = "123,456,789"
str = str.split(",")
print(str)
x,y,z = str
print("x:",x)
print("y:",y)
print("z:",z)
#运行结果 ['123', '456', '789'] x: 123 y: 456 z: 789
对dict序列解包获得key和value
#例1
dict1 = {"one":1,"two":2,"three":3}
x,y,z = dict1
print("key-x:",x)
print("key-y:",y)
print("key-z:",z)
print("value-x:",dict1[x])
print("value-y:",dict1[y])
print("value-z:",dict1[z])
#例2
dict1 = {"one":1}
x,y = dict1.popitem()
print("key:",x,"value:",y)
#运行结果 key-x: one key-y: two key-z: three value-x: 1 value-y: 2 value-z: 3 key: one value: 1
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