python 语言基础&数据结构（一)
>>> name = {"k1":"v1","k2":"v2","k3":"v3","k4":} >>> name["k1"]'v1'
>>> name["k4"]
>>> name["k4"]
1
>>> name["k4"][-1]
7
>>> name["k5"]="v5"
>>> name
{'k5': 'v5', 'k2': 'v2', 'k4': , 'k3': 'v3', 'k1': 'v1'}
>>> del name["k5"]
>>> name
{'k2': 'v2', 'k4': , 'k3': 'v3', 'k1': 'v1'}
>>> name["k5"]
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
KeyError: 'k5'
>>> for k in name:
... print("key:{},values:{}".format(k,name))
...
key:k2,values:v2
key:k4,values:
key:k3,values:v3
key:k1,values:v1
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