python从入门到实践第六章习题（高级编程技术 week3-2）

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# python从入门到实践 第六章习题 （高级编程技术 week3-2） #

这一节课主要讲的是在python中字典数据结构的使用。

## 字典的基本使用 ##

### 6-1 人 ###

dict={
        "first_name" : "Walker",
        "last_name" : "Mike",
        "age" : "18",
        "city" : "New York",
    }
    
    print('the first name is ', dict['first_name'])
    print('the last name is ', dict['last_name'])
    print('the age is ', dict['age'])
    print('the city is ', dict['city'])

## 6.3 遍历字典 ##

可以通过以下几个函数来生成字典的相关列表，并使用for来迭代遍历整个字典：  
1. dict.items():返回包含键-值对的列表。  
1. dict.keys():返回只包含键的列表。  
1. dict.values():返回只包含值的列表。

### 6-5 河流 ###

rivers = {
        'nile':'egypt',
        'Yellow River':'china',
        'Yangtze River':'china',
    }
    for river,country in rivers.items():
        print('The ', river.title(), ' runs through Egypt.')
    
    for river in rivers.keys():
        print('The name of river is ',river.title())
    
    for country in rivers.items():
        print('The country is ', country.title())

## 6-6 调查 ##

favorite_languages = {
          'jen': 'python',
          'sarah': 'c',
          'edward': 'ruby',
          'phil': 'python',
          }
    users = ['jen','john','ergou','mike','sarah','edward','phil']
    
    print("The following languages have been mentioned:")
    for name in users:
        if name in favorite_languages.keys():
            print('Thank you, ' + name.title())
        else:
            print('Would you participate in the survey?')

## 6.4 嵌套 ##

字典，列表之间的相互嵌套。

1.  在列表中存储字典
2.  在字典中存储列表
3.  在字典中存储字典

### 6-7 人 ###

walker={
        "first_name" : "Walker",
        "last_name" : "Mike",
        "age" : "18",
        "city" : "New York",
    }
    
    john={
        "first_name" : "John",
        "last_name" : "Mike",
        "age" : "19",
        "city" : "New York",
    }
    
    lily={
        "first_name" : "lily",
        "last_name" : "Mike",
        "age" : "17",
        "city" : "New York",
    }
    
    people = [walker, john, lily]
    
    for person in people:
        print(person['first_name'].title(), persion['last_name'].title(), ' is ', persion['age'], ' now living in ', person['city'], '.')

### 6-9 喜欢的地方 ###

favorite_places = {
        'john':['beijing', 'hang zhou'],
        'mike':['guang zhou'],
        'lily':['si chuang'],
    }
    
    for person, places in favorite_places.item():
        print(person.title(), ' likes these places:')
        for place in places:
            print('|',place)

### 6-11 ###

cities = {}
    cities['Guang Zhou'] = {
        'country':'china',
        'population':82342523,
        'fact':'This city is beautiful!',
    }
    
    cities['Hang Zhou'] = {
        'country':'china',
        'population':12982415,
        'fact':'This city is beautiful, too!',
    }
    
    cities['Beijing'] = {
        'country':'china',
        'population':129832415,
        'fact':'This city is big and beautiful!',
    }
    
    for city_name in cities.keys():
        for arg, content in cities[city_name].items():
            print('The ', arg, ,' of ', city_name, ' is ', content, ' .')

## 6.5 小结 ##

这一章学习了一些字典的简单使用方法。