字典是另一種可變容器模型，且可存儲任意類型對象。字典的每個鍵值(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號({})中 ,格式如下所示：

1、基本機構

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

2、字典的value可以是任何值

#!/usr/bin/env python
info = {
    "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 python
info ={
    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 python
info = {
    
 
"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、字典支持 del 刪除

#!/usr/bin/env python
info = {
    "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、支持for循環

#!/usr/bin/env python
info = {
    "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：

k1
2
k3
k4
k1
2
k3
k4
18
True
[11, [], (), 22, 33, {‘kk1‘: ‘vv1‘, ‘kk2‘: ‘vv2‘, ‘kk3‘: (11, 22)}]
(11, 22, 33, 44)
k1 18
2 True
k3 [11, [], (), 22, 33, {‘kk1‘: ‘vv1‘, ‘kk2‘: ‘vv2‘, ‘kk3‘: (11, 22)}]
k4 (11, 22, 33, 44)
k1 18
2 True
k3 [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