# 字典是一个无序、可变和有索引的集合
# thisdict = {
# 'brand': 'Porsche',
# 'model': '911',
# 'year': 1963
# }
# print(thisdict)
# 获取 "model" 键的值
# x = thisdict['model']
# x = thisdict.get('model')
# print(x)
# 改变year的值
# thisdict['year'] = 2022
# print(thisdict)
# 遍历字典
# for x in thisdict:
# # 打印所有键名
# print(x)
# # 打印所有的值
# print(thisdict[x])
# 返回所有的值
# for x in thisdict.values():
# print(x)
# 遍历键和值
# for x, y in thisdict.items():
# print(x, y)
# 检查键是否存在
# if 'model' in thisdict:
# print('Yes')
# 获取字典长度
# print(len(thisdict))
# 添加新的项目
# thisdict['color'] = 'red'
# print(thisdict)
# 删除项目
# thisdict.pop('model') # 指定键名删除
# thisdict.popitem() # 删除最后一个（在 3.7 之前的版本中，删除随机项目）
# del thisdict['model'] # del 关键字删除具有指定键名的项目
# del thisdict # del 关键字也可以完全删除字典
# thisdict.clear() # clear() 关键字清空字典
# print(thisdict)
# 复制字典
# 不能 dict2 = dict1 来复制字典
# 这样修改值都会发生变化
# thisdict = {
# 'name':'程坊村',
# 'address':'枫港乡',
# 'age':10
# }
# mydict = thisdict.copy()
# mydict = dict(thisdict)
# print(mydict)
# 嵌套字典
# myfamily = {
# "child1" : {
# "name" : "Phoebe Adele",
# "year" : 2002
# },
# "child2" : {
# "name" : "Jennifer Katharine",
# "year" : 1996
# },
# "child3" : {
# "name" : "Rory John",
# "year" : 1999
# }
# }
# print(myfamily)
# child1 = {
# "name" : "Phoebe Adele",
# "year" : 2002
# }
# child2 = {
# "name" : "Jennifer Katharine",
# "year" : 1996
# }
# child3 = {
# "name" : "Rory John",
# "year" : 1999
# }
# myfamily = {
# "child1" : child1,
# "child2" : child2,
# "child3" : child3
# }
# print(myfamily)
# dict() 构造函数
# thisdict = dict(name='abc', model=911, year=2022)
# print(thisdict)
# 创建拥有 3 个键的字典，值均为 0
# dict.fromkeys(keys, value)
# x = ('key1', 'key2', 'key3')
# y = 0
# thisdict = dict.fromkeys(x, y)
# 未指定值就为None
# thisdict = dict.fromkeys(x)
# print(thisdict)
# car = {
# 'name':'byd',
# 'model':'haibao',
# 'year':2022
# }
# x = car.setdefault('model')
# print(x)
# 如果没有键值会插入字典
# x = car.setdefault('color','red')
# print(car)
# 向字典插入项目
# car.update({'color':'red'})
# print(car)
# langs = {
# 'jen':'python',
# 'sarah':'c',
# 'edward':'ruby',
# 'phil':'php',
# 'cjl':'python'
# }
# 遍历所有的键
# for name in sorted(langs.keys()):
# print('Hello '+ name)
# 遍历所有的值
# for lang in langs.values():
# print(lang)
# 去除重复的值
# for lang in set(langs.values()):
# print(lang)
