[Python Study Notes]字典操作

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                      字典操作                                                                       

 

a.增加

1 >>> info["stu1104"] = "abc"2 >>> info3 {‘stu1102‘: ‘x5456‘, ‘stu1104‘: ‘abc‘, ‘stu1103‘: ‘Mali‘, ‘stu1101‘: ‘Wu‘}

 b.修改

1 >>> info[‘stu1101‘] = "xinge"2 >>> info3 {‘stu1102‘: ‘x5456‘, ‘stu1103‘:  Mali‘, ‘stu1101‘: ‘xinge‘}

 c.刪除

 1 >>> info 2 {‘stu1102‘: ‘LongZe Luola‘, ‘stu1103‘: ‘XiaoZe Maliya‘, ‘stu1101‘: ‘武藤蘭‘} 3 >>> info.pop("stu1101") #標準刪除姿勢 4 ‘武藤蘭‘ 5 >>> info 6 {‘stu1102‘: ‘LongZe Luola‘, ‘stu1103‘: ‘XiaoZe Maliya‘} 7 >>> del info[‘stu1103‘] #換個姿勢刪除 8 >>> info 9 {‘stu1102‘: ‘LongZe Luola‘}10 >>> 11 >>> 12 >>> 13 >>> info = {‘stu1102‘: ‘LongZe Luola‘, ‘stu1103‘: ‘XiaoZe Maliya‘}14 >>> info15 {‘stu1102‘: ‘LongZe Luola‘, ‘stu1103‘: ‘XiaoZe Maliya‘} #隨機刪除16 >>> info.popitem()17 (‘stu1102‘, ‘LongZe Luola‘)18 >>> info19 {‘stu1103‘: ‘XiaoZe Maliya‘}

 d.尋找

 1 >>> info = {‘stu1102‘: ‘LongZe Luola‘, ‘stu1103‘: ‘XiaoZe Maliya‘} 2 >>>  3 >>> "stu1102" in info #標準用法 4 True 5 >>> info.get("stu1102")  #擷取 6 ‘LongZe Luola‘ 7 >>> info["stu1102"] #同上，但是看下面 8 ‘LongZe Luola‘ 9 >>> info["stu1105"]  #如果一個key不存在，就報錯，get不會，不存在只返回None10 Traceback (most recent call last):11   File "<stdin>", line 1, in <module>12 KeyError: ‘stu1105‘

 e.擷取索引值

1 #values2 >>> info.values()3 dict_values([‘LongZe Luola‘, ‘XiaoZe Maliya‘])4 5 #keys6 >>> info.keys()7 dict_keys([‘stu1102‘, ‘stu1103‘])

 

f.合并

1 #update 2 >>> info3 {‘stu1102‘: ‘LongZe Luola‘, ‘stu1103‘: ‘XiaoZe Maliya‘, ‘stu1106‘: ‘Alex‘}4 >>> b = {1:2,3:4, "stu1102":"龍澤蘿拉"}5 >>> info.update(b)6 >>> info7 {‘stu1102‘: ‘龍澤蘿拉‘, 1: 2, 3: 4, ‘stu1103‘: ‘XiaoZe Maliya‘, ‘stu1106‘: ‘Alex‘}

 

g.深copy

1 import copy2    3 n1 = {"k1": "wu", "k2": 123, "k3": ["alex", 456]}4    5 n4 = copy.deepcopy(n1)

 

h.迴圈

1 #方法12 for key in info:3     print(key,info[key])4  5 #方法26 for k,v in info.items(): #會先把dict轉成list,資料裡大時莫用7     print(k,v)

 

[Python Study Notes]字典操作