《Python编程从入门到实践》第六章_字典

ゝ一世哀愁。 2022-05-15 05:42 277阅读 0赞

print("第六章 字典")
    allien_0 = {'color': 'green', 'points': 5}
    print("color:" + allien_0['color'])
    print("points: " + str(allien_0['points']))  # 通过str函数将数字转化为字符串
    #用户信息
    user = {'name':'Frank','age':'23','city':'shanghai'}
    print(user['name'])
    print(user['age'])
    print(user['city'])
    print("访问字典中的值")
    allien_0 = {'color': 'green'}
    print(allien_0['color'])
    allien_0 = {'color': 'green', 'points': 5}
    new_points = allien_0['points']
    print("You just earned " + str(new_points) + " points")
    print("6.2.2添加键-值对")
    allien_0 = {'color': 'green', 'points': 5}
    print(allien_0)
    allien_0['x_positon'] = 0
    allien_0['y_positon'] = 25
    print(allien_0)
    print("6.2.3创建一个空字典")
    allien_0 = {}
    allien_0['color'] = 'green'
    allien_0['points'] = 5
    print(allien_0)
    print("6.2.4修改字典中的值")
    allien_0 = {'color':'green'}
    print("The alien is " + allien_0['color'] + ".")
    allien_0['color'] = 'yellow'
    print("The alien is now " + allien_0['color'] + ".")
    print("6.2.5删除键-值对")
    user = {'name':'Frank','age':'23','city':'shanghai'}
    print(user)
    del user['name']
    print(user)
    print("6.2.6由类似对象组成的字典")
    # 最喜欢的语言
    # 确定需要使用多行来定义字典时 在输入左花括号后按回车键 再在下一行缩进四个空格
    favorite_languages = {
        'Jen': 'python',
        'Frank': 'c++',
        'Tom': 'JAVA',
        'liu': 'julia',
        }
    print(favorite_languages)
    print("liu's favorite language is " + favorite_languages['liu'].title() + ".")
    print("6.3 遍历字典")
    print("6.3.1 遍历所有的键-值对")
    favorite_languages = {
        'Jen': 'python',
        'Frank': 'c++',
        'Tom': 'JAVA',
        'Sabar': 'python',
        'Bob': 'ruby',
        }
    # 要是for循环遍历字典，可以使用两个变量，用于存储键-值。方法items()返回一个键-值队列表。
    for key, value in favorite_languages.items():
        print("key: " + key)
        print("value: " + value)
    for name, language in favorite_languages.items():
        print(name.title() + "'s favorite language is " + language.title() + ".")
    print("6.3.2遍历字典中所有键")
    favorite_languages = {
        'm': 'java',
        't': 'python',
        'n': 'c++',
        'nn': 'c++',
        }
    print(favorite_languages)
    for name in favorite_languages.keys():
        print(name.title())
    friends = ['m', 'n']
    for name in favorite_languages.keys():
        print(name.title())
        if name in friends:
            print("Hi " + name.title() + ", I see your favorite language is " + favorite_languages[name].title() + ".")
    if 'dd' not in favorite_languages.keys():
        print("Erin, please take our poll")
    print("6.3.3 按顺序遍历字典中的所有键")
    for name in sorted(favorite_languages.keys()):
        print(name.title() + ", thank you for taking the poll.")
    print("6.3.4遍历字典中所有值")
    print("The following languages have been mentioned: ")
    for language in favorite_languages.values():
        print(language.title())
    print("如上面的运行结果，我们看到了有重复的值，那么如何消除重复的值")
    print("The following languages have been mentioned: ")
    for language in set(favorite_languages.values()):
        print(language.title())
    print("6.4嵌套")
    allien_0 = {'color': 'green', 'points': 5}
    allien_1 = {'color': 'yellow', 'points': 10}
    allien_2 = {'color': 'red', 'points': 15}
    alliens = [allien_0, allien_1, allien_2]
    for allien in alliens:
        print(allien)
    
    # 创建一个用于存储外星人的空列表
    alliens = []
    
    # 创建30个绿色的外星人
    for allien_number in range(30):
        new_alien = {'color': 'green', 'points': 5,'speed': 'slow'}
        alliens.append(new_alien)
    # 显示前五个外星人
    for allien in alliens[:5]:
        print(allien)
    print("...")
    
    # 显示创建了多少个外星人
    print("Total number of aliens: " + str(len(alliens)))
    # 创建一个用于存储外星人的空列表
    aliens = []
    
    # 创建30个绿色的外星人
    for alien_number in range(0, 30):
        new_alien = {'color': 'green', 'points': 5, 'speed': 'slow'}
        aliens.append(new_alien)
    for alien in aliens[0:3]:
        if alien['color'] == 'green':
            alien['color'] = 'yellow'
            alien['speed'] = 'medium'
            alien['points'] = 10
    # 显示前五个外星人
    for alien in aliens[:5]:
        print(alien)
    print("...")
    for alien in aliens[0:3]:
        if alien['color'] == 'green':
            alien['color'] = 'yellow'
            alien['speed'] = 'medium'
            alien['points'] = 10
        elif alien['color'] == 'yellow':
            alien['color'] = 'red'
            alien['speed'] = 'fast'
            alien['points'] = 15
    # 显示前五个外星人
    for alien in aliens[:5]:
        print(alien)
    print("...")
    print("6.4.2在字典中存储列表")
    # 存储所点比萨的信息
    pizza = {
        'crust': 'thick',
        'toppings': ['mushrooms', 'extra cheese']
        }
    # 概述所点的比萨
    print("You ordered a " + pizza['crust'] + "-crust pizza" + "with the following toppings:")
    for topping in pizza['toppings']:
        print("\t" + topping)
    favorite_languages = {
        'jen': ['python', 'ruby'],
        'sarah': ['c'],
        'edward': ['ruby', 'go'],
        'phil': ['python', 'haskell'],
        }
    for name, languages in favorite_languages.items():
        print("\n" + name.title() + "'s favorite language are: ")
        for language in languages:
            print("\t" + language.title())
    print("6.4.3在字典里面存储字典")
    # 信息字典
    user = {
        'aeinstein': {
            'first': 'albert',
            'last': 'einstein',
            'location': 'princeton',
                     },
        'mcurie': {
            'first': 'marie',
            'last': 'curie',
            'location': 'paris',
                 },
            }
    for username, user_info in user.items():
        print("\nUsername:", username)
        fullname = user_info['first'] + ' ' + user_info['last']
        location = user_info['location']
        print("\tFull name:" + fullname.title())
        print("\tLocation:" + location.title())

C:\Anaconda3\python.exe H:/python/venv/text
    第六章 字典
    color:green
    points: 5
    Frank
    23
    shanghai
    访问字典中的值
    green
    You just earned 5 points
    6.2.2添加键-值对
    {'color': 'green', 'points': 5}
    {'color': 'green', 'points': 5, 'x_positon': 0, 'y_positon': 25}
    6.2.3创建一个空字典
    {'color': 'green', 'points': 5}
    6.2.4修改字典中的值
    The alien is green.
    The alien is now yellow.
    6.2.5删除键-值对
    {'name': 'Frank', 'age': '23', 'city': 'shanghai'}
    {'age': '23', 'city': 'shanghai'}
    6.2.6由类似对象组成的字典
    {'Jen': 'python', 'Frank': 'c++', 'Tom': 'JAVA', 'liu': 'julia'}
    liu's favorite language is Julia.
    6.3 遍历字典
    6.3.1 遍历所有的键-值对
    key: Jen
    value: python
    key: Frank
    value: c++
    key: Tom
    value: JAVA
    key: Sabar
    value: python
    key: Bob
    value: ruby
    Jen's favorite language is Python.
    Frank's favorite language is C++.
    Tom's favorite language is Java.
    Sabar's favorite language is Python.
    Bob's favorite language is Ruby.
    6.3.2遍历字典中所有键
    {'m': 'java', 't': 'python', 'n': 'c++', 'nn': 'c++'}
    M
    T
    N
    Nn
    M
    Hi M, I see your favorite language is Java.
    T
    N
    Hi N, I see your favorite language is C++.
    Nn
    Erin, please take our poll
    6.3.3 按顺序遍历字典中的所有键
    M, thank you for taking the poll.
    N, thank you for taking the poll.
    Nn, thank you for taking the poll.
    T, thank you for taking the poll.
    6.3.4遍历字典中所有值
    The following languages have been mentioned: 
    Java
    Python
    C++
    C++
    如上面的运行结果，我们看到了有重复的值，那么如何消除重复的值
    The following languages have been mentioned: 
    Python
    C++
    Java
    6.4嵌套
    {'color': 'green', 'points': 5}
    {'color': 'yellow', 'points': 10}
    {'color': 'red', 'points': 15}
    {'color': 'green', 'points': 5, 'speed': 'slow'}
    {'color': 'green', 'points': 5, 'speed': 'slow'}
    {'color': 'green', 'points': 5, 'speed': 'slow'}
    {'color': 'green', 'points': 5, 'speed': 'slow'}
    {'color': 'green', 'points': 5, 'speed': 'slow'}
    ...
    Total number of aliens: 30
    {'color': 'yellow', 'points': 10, 'speed': 'medium'}
    {'color': 'yellow', 'points': 10, 'speed': 'medium'}
    {'color': 'yellow', 'points': 10, 'speed': 'medium'}
    {'color': 'green', 'points': 5, 'speed': 'slow'}
    {'color': 'green', 'points': 5, 'speed': 'slow'}
    ...
    {'color': 'red', 'points': 15, 'speed': 'fast'}
    {'color': 'red', 'points': 15, 'speed': 'fast'}
    {'color': 'red', 'points': 15, 'speed': 'fast'}
    {'color': 'green', 'points': 5, 'speed': 'slow'}
    {'color': 'green', 'points': 5, 'speed': 'slow'}
    ...
    6.4.2在字典中存储列表
    You ordered a thick-crust pizzawith the following toppings:
    	mushrooms
    	extra cheese
    
    Jen's favorite language are: 
    	Python
    	Ruby
    
    Sarah's favorite language are: 
    	C
    
    Edward's favorite language are: 
    	Ruby
    	Go
    
    Phil's favorite language are: 
    	Python
    	Haskell
    6.4.3在字典里面存储字典
    
    Username: aeinstein
    	Full name:Albert Einstein
    	Location:Princeton
    
    Username: mcurie
    	Full name:Marie Curie
    	Location:Paris
    
    Process finished with exit code 0