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：
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>>> 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
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>>> 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]1:123111:python3tuple:(4, 5, 6) |
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>>> d={'list':[1, 2, 3],1:123,'111':'python3','tuple':(4, 5, 6)}>>> for key in d.keys(): print(key)1list111tuple |
2. 遍历字典的值value
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>>> d={'list':[1, 2, 3],1:123,'111':'python3','tuple':(4, 5, 6)}>>> for value in d.values(): print (value)[1, 2, 3]123python3(4, 5, 6) |
3. 遍历字典的项
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>>> 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
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>>> 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 123111 python3tuple (4, 5, 6) |
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>>> 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 123111 python3tuple (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。
原文链接：https://blog.csdn.net/sxingming/article/details/51201258
