字典{}

字典的表示方法&＃xff1a;info_dic&＃61;{&＃39;name&＃39;:&＃39;haiyna&＃39;,&＃39;age&＃39;:18,&＃39;sex&＃39;:&＃39;female&＃39;}
# 常用操作&＃xff1a;
#
1.存/取
info_dic&＃61;{&＃39;name&＃39;:&＃39;egon&＃39;,&＃39;age&＃39;:18,&＃39;sex&＃39;:&＃39;male&＃39;}print(info_dic[&＃39;name11111111&＃39;])#找不到则报错了print(info_dic.get(&＃39;name&＃39;,None))print(info_dic.get(&＃39;name222222&＃39;,None))#get方法找不到不报错&＃xff0c;可以自己设定默认值#pop&＃xff1a;key存在则弹出值&＃xff0c;不存在则返回默认值&＃xff0c;如果没有默认值则报错
# print(info_dic.pop(&＃39;nam123123123123123123e&＃39;,None))
# print(info_dic)# print(info_dic.popitem())
# print(info_dic)# info_dic[&＃39;level&＃39;]&＃61;10
# print(info_dic)#
# 　　　　删除
info_dic&＃61;{&＃39;name&＃39;:&＃39;egon&＃39;,&＃39;age&＃39;:18,&＃39;sex&＃39;:&＃39;male&＃39;}
# info_dic.pop()
# info_dic.popitem()# del info_dic[&＃39;name&＃39;]#
# 　　　　键s&＃xff0c;值s&＃xff0c;键值对
info_dic&＃61;{&＃39;name&＃39;:&＃39;egon&＃39;,&＃39;age&＃39;:18,&＃39;sex&＃39;:&＃39;male&＃39;}
# print(info_dic.keys())
# print(info_dic.values())
# print(info_dic.items())# for k in info_dic:
# # print(k,info_dic[k])
# print(k)# print(&＃39;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;>&＃39;)
# for k in info_dic.keys():
# print(k)# for val in info_dic.values():
# print(val)# for k,v in info_dic.items(): #k,v&＃61;(&＃39;name&＃39;, &＃39;egon&＃39;)
# print(k,v)# 　　　　长度
# info_dic&＃61;{&＃39;name&＃39;:&＃39;egon&＃39;,&＃39;age&＃39;:18,&＃39;sex&＃39;:&＃39;male&＃39;}
# print(len(info_dic))
#
# 　　　　循环
#
# 　　　　包含in# info_dic&＃61;{&＃39;name&＃39;:&＃39;egon&＃39;,&＃39;age&＃39;:18,&＃39;sex&＃39;:&＃39;male&＃39;}
# print(&＃39;name&＃39; in info_dic)
# print(&＃39;name&＃39; in info_dic.keys())
# print(&＃39;egon&＃39; in info_dic.values())
# print((&＃39;name&＃39;,&＃39;egon&＃39;) in info_dic.items())#掌握
info_dic&＃61;{&＃39;name&＃39;:&＃39;egon&＃39;,&＃39;age&＃39;:18,&＃39;sex&＃39;:&＃39;male&＃39;}
# info_dic.update({&＃39;a&＃39;:1,&＃39;name&＃39;:&＃39;Egon&＃39;})
# print(info_dic)# info_dic[&＃39;hobbies&＃39;]&＃61;[]
# info_dic[&＃39;hobbies&＃39;].append(&＃39;study&＃39;)
# info_dic[&＃39;hobbies&＃39;].append(&＃39;read&＃39;)
# print(info_dic)#setdefault:key不存在则设置默认值&＃xff0c;并且放回值默认值
#key存在则不设置默认&＃xff0c;并且返回已经有的值# info_dic.setdefault(&＃39;hobbies&＃39;,[1,2])
# print(info_dic)
# info_dic.setdefault(&＃39;hobbies&＃39;,[1,2,3,4,5])
# print(info_dic)# info_dic&＃61;{&＃39;name&＃39;:&＃39;haiyan&＃39;,&＃39;age&＃39;:18,&＃39;sex&＃39;:&＃39;male&＃39;}# {&＃39;name&＃39;:&＃39;egon&＃39;,&＃39;age&＃39;:18,&＃39;sex&＃39;:&＃39;male&＃39;,&＃39;hobbies&＃39;:[&＃39;study&＃39;]}
# info_dic.setdefault(&＃39;hobbies&＃39;,[]).append(&＃39;study&＃39;)# {&＃39;name&＃39;:&＃39;egon&＃39;,&＃39;age&＃39;:18,&＃39;sex&＃39;:&＃39;male&＃39;,&＃39;hobbies&＃39;:[&＃39;study&＃39;,&＃39;read&＃39;]}
# info_dic.setdefault(&＃39;hobbies&＃39;,[]).append(&＃39;read&＃39;)# {&＃39;name&＃39;:&＃39;egon&＃39;,&＃39;age&＃39;:18,&＃39;sex&＃39;:&＃39;male&＃39;,&＃39;hobbies&＃39;:[&＃39;study&＃39;,&＃39;read&＃39;,&＃39;sleep&＃39;]}
# info_dic.setdefault(&＃39;hobbies&＃39;,[]).append(&＃39;sleep&＃39;)
# l&＃61;info_dic.setdefault(&＃39;hobbies&＃39;,[])
# print(l,id(l))
# print(id(info_dic[&＃39;hobbies&＃39;]))# print(info_dic)#了解
# d&＃61;info_dic.copy()
# print(d)
# info_dic.clear()
# print(info_dic)# d&＃61;info_dic.fromkeys((&＃39;name&＃39;,&＃39;age&＃39;,&＃39;sex&＃39;),None)
# print(d)
# d1&＃61;dict.fromkeys((&＃39;name&＃39;,&＃39;age&＃39;,&＃39;sex&＃39;),None)
# d2&＃61;dict.fromkeys((&＃39;name&＃39;,&＃39;age&＃39;,&＃39;sex&＃39;),(&＃39;egon&＃39;,18,&＃39;male&＃39;))
# print(d1)
# print(d2)# info&＃61;dict(name&＃61;&＃39;haiyan&＃39;,age&＃61;18,sex&＃61;&＃39;male&＃39;)
# print(info)#
# info&＃61;dict([(&＃39;name&＃39;,&＃39;haiyan&＃39;),(&＃39;age&＃39;,18)])
# print(info)