1.字典

2.字典的方法

3.集合

4.集合的操作

 1 # 创建一个字典
 2 dic ={"a":1,"b":2,"c":3,"d":4}
 3 # 为字典增加一个键值对: "e": 5
 4 dic['e']=5
 5 print(dic)# 结果为: {"a": 1, "b" :2, "c": 3, "d": 4, 'e': 5}
 6 # 为字典增加一个键值对: "f": 6
 7 dic.setdefault('f',6)
 8 print(dic)# 结果为: {"a": 1, "b" :2, "c": 3, "d": 4, 'e': 5, 'f': 6}
 9 # 创建一个字典dic2, 键是列表lst=["you", "me", "him"]中的元素, 每个键对应的值都是0
10 dic2 ={}
11 dic2.fromkeys(['you','me','him'],0)
12 print(dic2)# 结果为: {'you': 0, 'me': 0, 'him':0}

13 # 删除dic一个键值对: "e":5
14 dic.pop('e')
15 print(dic)# 结果为: {"a": 1, "b" :2, "c": 3, "d": 4, 'f': 6}

16 # 删除dic的最后一个键值对: 'f':6
17 dic.popitem()
18 print(dic)# 结果为: {"a": 1, "b" :2, "c": 3, "d": 4}

19 # 删除字典dic2中的键值对: "me":0
20 del dic2['me']
21 print dic2 # 结果为: {'you': 0, 'him':0}

22 # 清空dic2中的所有键值对
23 dic2.clear()
24 print(dic)# 结果为: {}

25 # 给dic的键'd'赋值为666
26 dic['d']=666
27 print(dic)# 结果为: {"a": 1, "b" :2, "c": 3, "d": 666}

28 #将字典{'x': 110, 'y': 114, 'z': 120}更新到字典dic中
29 d ={'x':110,'y':114,'z':120}
30 dic.updata(d)
31 print(dic)# 结果为 {"a": 1, "b" :2, "c": 3, "d": 666, 'x': 110, 'y': 114, 'z': 120}

32 # 获取dic中键'a'对应的值
33 print(dic['a'])# 结果为: 1
34 print(dic.get('a'))# 结果为: 1

35 # 获取dic的所有键
36 print(dic.keys)# 结果为: dict_keys(['a', 'b', 'c', 'd', 'x', 'y', 'z'])

37 # 获取dic的所有值
38 print(dic.values())# 结果为:dict_values([1, 2, 3, 666, 110, 114, 120])

39 # 获取dic的所有键
40 print(dic.items())# 结果为: dict_items([('a', 1), ('b', 2), ('c', 3), ('d', 666), ('x', 110), ('y', 114), ('z', 120)])