"""#创建字典dic1={name:zew,age:18,sex:男}print(dic1)dic2=dict(one=1,two=2,three=3)#自动拆包print(dic2)dic3=dict(((one,1),(tow,2),(three,3)))print(dic3)dic4=dict(zip([one,two,three],[1,2,3]))print(dic4)dic5={k:vfork,vin[(one,1),(two,2),(three,3)]}print(dic5)dic6=dict.fromkeys(,zew)print(dic6)#1、增dic7={}#通过键值对直接增加,如果key存在，则改变key对应的value值dic7[name]=zewprint(dic7)dic7[name]=ljxprint(dic7)#setdefault关键字，如果key不存在，则增加key-value，如果key存在，则不改变key对应的值;#所以setdefault主要用来在dict中添加键值对；#setdefault有返回值dic7.setdefault(age,18)#{name:ljx,age:18}print(dic7)age=dic7.setdefault(age,20)#{name:ljx,age:18}print(dic7)print(age)#18#2、删#pop通过键删除键值对，有返回值，可设置返回值dic={name:zew,age:18,sex:0}sex=dic.pop(sex)print(dic,sex)#{name:zew,age:18}0hobby=dic.pop(hobby,无此键值对)print(dic,hobby)#{name:zew,age:18}无此键值对#popitem3.5版本之前为随机删除，3.6之后为删除最后一个，有返回值print(dic)#{name:zew,age:18}flag=dic.popitem()print(dic,flag)#{name:zew}(age,18)#clear清空print(dic)#{name:zew}dic.clear()print(dic)#{}#dela.通过key删除键值对b.删除整个字典dic={name:zew,age:18,sex:0}deldic[name]print(dic)#{age:18,sex:0}deldicprint(dic)#NameError:namedicisnotdefined#3、改#通过键直接改值dic={name:zew,age:18,sex:0}dic[name]=ljxprint(dic)#{name:ljx,age:18,sex:0}#updatekey不存在则追加，存在则改变key对应的value值dic.update(hobby=run)print(dic)#{name:ljx,age:18,sex:0,hobby:run}dic.update(name=weij)print(dic)#{name:weij,age:18,sex:0,hobby:run}#update对列表中的元组拆包，追加到原字典dic.update([(1,a),(2,b),(3,c),(4,d)])print(dic)#update将字典追加到原字典,如果字典中的key在原字典中存在，则更新key对应的value值dic2={name:zew,weight:}print(dic)#{name:weij,age:18,sex:0,hobby:run,1:a,2:b,3:c,4:d}dic.update(dic2)print(dic)#{name:zew,age:18,sex:0,hobby:run,1:a,2:b,3:c,4:d,weight:}print(dic2)#{name:zew,weight:}#4、查#直接dic[key]，key不存在时会报错dic={name:zew,age:18,sex:0}print(dic[name])#print(dic[hobby])#KeyError:hobby#get关键字，有返回值；key不存在时，返回None，可设置返回值v=dic.get(name)print(v)#zewv=dic.get(hobby)print(v)#Nonev=dic.get(hobby,Key不存在)print(v)#Key不存在#keys关键字,获取字典所有的keyprint(dic.keys())#dict_keys([name,age,sex])#转换成列表print(list(dic.keys()))#[name,age,sex]#遍历keyforkeyindic.keys():print(key)#values关键字，获取字典所有的valueprint(dic.values())#dict_values([zew,18,0])#转换成列表print(list(dic.values()))#[zew,18,0]#遍历valueforvalueindic.values():print(value)#items关键字print(dic.items())#dict_items([(name,zew),(age,18),(sex,0)])#转换成原则print(tuple(dic.items()))#((name,zew),(age,18),(sex,0))#遍历items并将元组拆包fork,vindic.items():print(k,v)"""#列表的嵌套dic={name:汪峰,age:48,wife:[{name:国际章,age:38}],children:{girl_first:小苹果,girl_second:小怡,girl_three:顶顶}}#1.获取汪峰的名字。print(dic.get(name))#2.获取这个字典：{name:国际章,age:38}。print(dic.get(wife)[0])#{name:国际章,age:38}#3.获取汪峰妻子的名字。print(dic.get(wife)[0][name])#国际章#4.获取汪峰的第三个孩子名字。print(dic[children].get(girl_three))#顶顶预览时标签不可点收录于话题#个上一篇下一篇