论坛 › Python › python基本数据类型-字典

kuuty 发表于 2016-4-14 09:18:30

python基本数据类型-字典

1.创建字典

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>>> dic = {'k1':'v1','k2':'v2','k3':'v3'}





2.索引

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>>> dic['k1']
'v1'
>>> dic['k2']
'v2'





3.新增

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>>> dic['k4'] = 'v4'
>>> dic
{'k3': 'v3', 'k2': 'v2', 'k1': 'v1', 'k4': 'v4'}





4.删除

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>>> del dic['k4']
>>> dic
{'k3': 'v3', 'k2': 'v2', 'k1': 'v1'}





5.

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>>> dic.keys()
['k3', 'k2', 'k1']
>>> dic.values()
['v3', 'v2', 'v1']
>>> dic.items()
[('k3', 'v3'), ('k2', 'v2'), ('k1', 'v1')]





6.循环

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>>> for k,v in dic.items():
...   print(k,v)
...
('k3', 'v3')
('k2', 'v2')
('k1', 'v1')





7.长度

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>>> len(dic)
3

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