本文实例讲述了Python3字典遍历操作。分享给大家供大家参考，具体如下：

字典是针对非序列集合而提供的一种数据类型。

通过任意键查找集合中值信息的过程叫映射，python通过字典实现映射。

为字典赋值：

>>> d={'list':[1, 2, 3],1:123,'111':'python3','tuple':(4, 5, 6)}

>>> print(d)

{1: 123, 'list': [1, 2, 3], '111': 'python3', 'tuple': (4, 5, 6)}

以上语句说明，字典中各项的顺序与赋值时的顺序可能不一致，即字典是无序的。

字典的遍历有一下几种：

1. 遍历字典的键key

①

>>> d={'list':[1, 2, 3],1:123,'111':'python3','tuple':(4, 5, 6)}

>>> for key in d:

print(str(key)+':'+str(d[key]))

list:[1, 2, 3]

1:123

111:python3

tuple:(4, 5, 6)

②

>>> d={'list':[1, 2, 3],1:123,'111':'python3','tuple':(4, 5, 6)}

>>> for key in d.keys():

print(key)

1

list

111

tuple

2. 遍历字典的值value

>>> d={'list':[1, 2, 3],1:123,'111':'python3','tuple':(4, 5, 6)}

>>> for value in d.values():

print (value)

[1, 2, 3]

123

python3

(4, 5, 6)

3. 遍历字典的项

>>> d={'list':[1, 2, 3],1:123,'111':'python3','tuple':(4, 5, 6)}

>>> for item in d.items():

print(item)

('list', [1, 2, 3])

(1, 123)

('111', 'python3')

('tuple', (4, 5, 6))

4. 遍历字典的key-value

①

>>> d={'list':[1, 2, 3],1:123,'111':'python3','tuple':(4, 5, 6)}

>>> for key,value in d.items():

print(key,value)

list [1, 2, 3]

1 123

111 python3

tuple (4, 5, 6)

②

>>> d={'list':[1, 2, 3],1:123,'111':'python3','tuple':(4, 5, 6)}

>>> for (key,value) in d.items():

print(key,value)

list [1, 2, 3]

1 123

111 python3

tuple (4, 5, 6)

上述示例运行效果如下图所示：

以上便是，python字典遍历的几种方式。

希望本文所述对大家Python程序设计有所帮助。