python學習之字典

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字典是另一種可變容器模型，且可儲存任意類型對象。字典的每個索引值(key=>value)對用冒號(:)分割，每個對之間用逗號(,)分割，整個字典包括在花括弧({})中 ,格式如下所示：

1、基本機構

info = {    "k1": "v1", # 索引值對    "k2": "v2"  # 索引值對}

 2、字典的value可以是任何值

#!/usr/bin/env pythoninfo = {    "k1": 18,    "k2": True,    "k3": [        11,        [],        (),        22,        33,        {            ‘kk1‘: ‘vv1‘,            ‘kk2‘: ‘vv2‘,            ‘kk3‘: (11,22),        }    ],    "k4": (11,22,33,44)}print(info)

 

結果：

{‘k1‘: 18, ‘k2‘: True, ‘k3‘: [11, [], (), 22, 33, {‘kk1‘: ‘vv1‘, ‘kk2‘: ‘vv2‘, ‘kk3‘: (11, 22)}], ‘k4‘: (11, 22, 33, 44)}

 

3、布爾值(1,0)、列表、字典不能作為字典的key

#!/usr/bin/env pythoninfo ={    1: ‘asdf‘,    "k1": ‘asdf‘,    True: "123",    # [11,22]: 123    (11,22): 123,    # {‘k1‘:‘v1‘}: 123}print(info)

 

結果：

{1: ‘123‘, ‘k1‘: ‘asdf‘, (11, 22): 123}

 

4、索引方式找到指定元素

#!/usr/bin/env pythoninfo = {    "k1": 18,    2: True,    "k3": [        11,        [],        (),        22,        33,        {            ‘kk1‘: ‘vv1‘,            ‘kk2‘: ‘vv2‘,            ‘kk3‘: (11,22),        }    ],    "k4": (11,22,33,44)}v = info[‘k3‘][5][‘kk3‘][0]print(v)

 

結果：

11

 

5、字典支援 del 刪除

#!/usr/bin/env pythoninfo = {    "k1": 18,    2: True,    "k3": [        11,        [],        (),        22,        33,        {            ‘kk1‘: ‘vv1‘,            ‘kk2‘: ‘vv2‘,            ‘kk3‘: (11,22),        }    ],    "k4": (11,22,33,44)}del info[‘k1‘]del info[‘k3‘][5][‘kk1‘]print(info)

 

結果：

{2: True, ‘k3‘: [11, [], (), 22, 33, {‘kk2‘: ‘vv2‘, ‘kk3‘: (11, 22)}], ‘k4‘: (11, 22, 33, 44)}

 

6、支援for迴圈

#!/usr/bin/env pythoninfo = {    "k1": 18,    2: True,    "k3": [        11,        [],        (),        22,        33,        {            ‘kk1‘: ‘vv1‘,            ‘kk2‘: ‘vv2‘,            ‘kk3‘: (11,22),        }    ],    "k4": (11,22,33,44)}for item in info:    print(item)for item in info.keys():    print(item)for item in info.values():    print(item)for item in info.keys():    print(item,info[item])for k,v in info.items():    print(k,v)info ={    "k1": ‘asdf‘,    True: "123",    # [11,22]: 123    (11,22): 123,    # {‘k1‘:‘ v1‘}: 123}print(info)

 

結果：

k12k3k4k12k3k418True[11, [], (), 22, 33, {‘kk1‘: ‘vv1‘, ‘kk2‘: ‘vv2‘, ‘kk3‘: (11, 22)}](11, 22, 33, 44)k1 182 Truek3 [11, [], (), 22, 33, {‘kk1‘: ‘vv1‘, ‘kk2‘: ‘vv2‘, ‘kk3‘: (11, 22)}]k4 (11, 22, 33, 44)k1 182 Truek3 [11, [], (), 22, 33, {‘kk1‘: ‘vv1‘, ‘kk2‘: ‘vv2‘, ‘kk3‘: (11, 22)}]k4 (11, 22, 33, 44){‘k1‘: ‘asdf‘, True: ‘123‘, (11, 22): 123}

 

python學習之字典