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第六章 字典
6.1 一个简单的字典
6.2 使用字典
在Python中 字典是一系列 键-值 对。并且将字典放在{}中
6.2.1 访问字典中的值
6.2.2 添加键-值对
6.2.3 先创建一个空字典
使用字典来存储用户提供的数据活在编写能自动生成大量键-值对的代码时 通常都需要定义一个空字典
6.2.4 修改字典中的值
是真的改变了值
6.2.5 删除键-值对
有点懒 哈哈哈哈哈
不过呢 删除也是 永久删除的哈
6.2.6 由类似对象组成的字典
一定一定要注意格式！！！不要漏写逗号！！！
6.2 动手试一试
- 6-1 人
people = {'first_name' : 'sean','last_name' : 'yi','age' : 20,'city' : 'kunming'}print (people)
- 6-2 喜欢的数字
# 假的数据 没有之一
favorite_number = {'yc':9,'cy':8,'yyc':7,'ycc':6,'yyy':5}print (favorite_number)print ("\nYc's favorite_number is " + str(favorite_number['yc']) + ".")
print ("\nCy's favorite_number is " + str(favorite_number['cy']) + ".")
print ("\nYyc's favorite_number is " + str(favorite_number['yyc']) + ".")
print ("\nYcc's favorite_number is " + str(favorite_number['ycc']) + ".")
print ("\nYyy's favorite_number is " + str(favorite_number['yyy']) + ".")
- 6-3 词汇表
不想写完了 但是写法是对的
glossaries = {'algorithm' : '算法','reference' : '引用','summary' : '摘要','alert' : '警告','indicate' : '表明，指出'
}print ('algorithm : ' + str(glossaries["algorithm"]))
6.3 遍历字典
6.3.1 遍历所有的键-值对
6.3.2 遍历字典中的所有键
6.3.3 按顺序遍历字典中的所有键
6.3.4 遍历字典中的所有值
如何做到元素的独一无二呢
6.3 动手试一试
- 6-4 词汇表
glossaries = {'algorithm' : '算法','reference' : '引用','summary' : '摘要','alert' : '警告','indicate' : '表明，指出'
}
for k,v in glossaries.items():print ("编程词汇 : " + k)print ("含义 : " + v)
- 6-5 河流
rivers = {"NileRiver" : "egypt" ,"AmazonRiver" : "peru" ,"ChangjiangRiver" : "china" ,}for n,t in rivers.items():print ("The " + n.title() + " runs through " + t.title() +".")print (n.title())print (t.title())
- 6-6 调查
6.4 嵌套
6.4.1 字典列表
6.4.2 在字典中存储列表
6.4.3 在字典中存储字典
还是提示符号不要漏写
该程序两个字典的结构相同 所以不复杂
6.4 动手试一试
- 6-7 人
改信息就好了 太懒了 只写了个意思
yc_0 = {'first_name' : 'sean','last_name' : 'yi','age' : 20,'city' : 'kunming'}yc_1 = {'first_name' : 'sean','last_name' : 'yi','age' : 20,'city' : 'kunming'}yc_2 = {'first_name' : 'sean','last_name' : 'yi','age' : 20,'city' : 'kunming'}people = [yc_0,yc_1,yc_2]for yc in people:print (yc)
- 6-8 宠物
我觉得和上面那个一样
yc_0 = {'type' : 'cat' , 'name' : 'cc' , }yc_1 = {'type' : 'cat' , 'name' : 'ccc' , }yc_2 = {'type' : 'cat' , 'name' : 'ccccc' , }pets = [yc_0,yc_1,yc_2]for yc in pets:print (yc)
- 6-9 喜欢的地方
favorite_places = {'yc' : ['paris','rome' ], 'ycc' : ['rome' , 'paris'],
}for name,places in favorite_places.items():print ("\n" + name.title() + "'s favorite places are: ")for place in places:print ("\t" + place.title())
- 6-10 喜欢的数字
favorite_number = {'yc':'9','cy':['9,8,7'],'yyc':['7,6'],'ycc':['6,5,4'],'yyy':['4,3,2,1'],}print (favorite_number)for users,numbers in favorite_number.items():print (users.title() + "'s favorite numbers is : ")for number in numbers:print ("\t" + str(number))print ("Yc's favorite_number is " + str(favorite_number['yc']) + ".")
print ("Cy's favorite_number is " + str(favorite_number['cy']) + ".")
print ("Yyc's favorite_number is " + str(favorite_number['yyc']) + ".")
print ("Ycc's favorite_number is " + str(favorite_number['ycc']) + ".")
print ("Yyy's favorite_number is " + str(favorite_number['yyy']) + ".")
- 6-11 城市
cities = {'city_0' : {'county' : 'one' , 'population' : '10' , 'fact' : '人不多' ,},'city_1' : {'county' : 'two' , 'population' : '10000' , 'fact' : '人有点多' ,},'city_2' : {'county' : 'three' , 'population' : '10000000' , 'fact' : '人很多' ,},
}for city,introduction in cities.items():city = introduction['county']fact = introduction['fact']population = introduction['population']print ("\n" + city.title() + "的" + fact + "人口数为 : " + population )
- 6-12 扩展
不写了懒
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