Python之字典的遍歷
阿新 • • 發佈:2019-01-05
0、恐怕除了建立字典,就是遍歷字典用的最多了,不總結都不行
1、第一種,for in , 拿到每一個key,那就好辦了
girl_dict= {"china": "小美", "japan": "圖多天光", "korean": "斯密達美"}
for everyKey in girl_dict:
print "key:" + everyKey + " value:" + girl_dict[everyKey]
輸出結果:
key:japan value:圖多天光 key:korean value:斯密達美 key:china value:小美
2、第二種,仍然是for in, 還是拿到每一個key,這次用了dict的keys函式(),哈哈,怒贊,看來for in dict 等同於 for in dict.keys()哈
girl_dict= {"china": "小美", "japan": "圖多天光", "korean": "斯密達美"}
for everyKey in girl_dict.keys():
print "key:" + everyKey + " value:" + girl_dict[everyKey]
輸出結果:
key:japan value:圖多天光 key:korean value:斯密達美 key:china value:小美
3、第三種,還是for in, 不過是遍歷value值,這次躲不掉了, values()函式,嘿嘿
girl_dict= {"china": "小美", "japan": "圖多天光", "korean": "斯密達美"}
for everyValue in girl_dict.values():
print everyValue
4、第四種,遍歷字典中的每一個Entry
girl_dict= {"china": "小美", "japan": "圖多天光", "korean": "斯密達美"} for everyEntry in girl_dict.items(): print everyEntry
輸出結果:你會發現每一個Entry,都是key和value組成的一個元組
('japan', '\xe5\x9b\xbe\xe5\xa4\x9a\xe5\xa4\xa9\xe5\x85\x89')
('korean', '\xe6\x96\xaf\xe5\xaf\x86\xe8\xbe\xbe\xe7\xbe\x8e')
('china', '\xe5\xb0\x8f\xe7\xbe\x8e')
如果是把每個元組的元素都分別取出來,就會把key和value都正確都輸出了哦
print everyEntry[0] + ":" + everyEntry[1]
輸出結果:
japan:圖多天光
korean:斯密達美
china:小美
5、第五種,直接遍歷Entry的key與value,仍然是用items()函式
girl_dict= {"china": "小美", "japan": "圖多天光", "korean": "斯密達美"}
for key,value in girl_dict.items(): #for (key,value) in girl_dict.items() 這樣加上括號也可以
print key + ":" + value
輸出結果:
japan:圖多天光
korean:斯密達美
china:小美