高级编程技术（Python）作业8

8-8 用户的专辑：在为完成练习8-7编写的程序中，编写一个while 循环，让用户输入一个专辑的歌手和名称。获取这些信息后，使用它们来调用函数make_album()，并将创建的字典打印出来。在这个while 循环中，务必要提供退出途径。

Solution：

def make_album(singer, album_name, song_num=""):
    """make a dictionary of a album by singer, album name and song number"""
    if song_num:
        album = {'singer': singer, 'album name': album_name, 
                 'song number': song_num}
    else:
        album = {'singer': singer, 'album name': album_name}
    return album


active = True
while active:
    Singer_name = input("Singer name: ")
    Album_name = input("Album name: ")
    Song_num = input("Song number: ")
    Album = make_album(Singer_name, Album_name, Song_num)
    print(Album)
    while True:
        repeat = input("Still have another album? Y/N\n")
        if (repeat == "N"):
            active = False
            break
        elif(repeat == "Y"):
            print("Next one.\n")
            break
        else:
            print("Wrong input. Please input again.\n")

Output：

Singer name: Azis
Album name: Diva
Song number: 
{'singer': 'Azis', 'album name': 'Diva'}
Still have another album? Y/N
Y
Next one.

Singer name: Mayday
Album name: Second Bound
Song number: 16
{'singer': 'Mayday', 'album name': 'Second Bound', 'song number': '16'}
Still have another album? Y/N
djdj
Wrong input. Please input again.

Still have another album? Y/N

8-11 不变的魔术师：修改你为完成练习8-10而编写的程序，在调用函数make_great()时，向它传递魔术师列表的副本。由于不想修改原始列表，请返回修改后的列表，并将其存储到另一个列表中。分别使用这两个列表来调用show_magicians()，确认一个列表包含的是原来的魔术师名字，而另一个列表包含的是添加了字样“the Great”的魔术师名字。

Solution：

def show_megicians(_magicians):
    """magician's name"""
    for magician in _magicians:
        print("\t" + magician)


def make_great(_magicians):
    """the Great magician's name"""
    size = len(_magicians)
    while size:
        _magicians[size-1] = "the Great " + _magicians[size-1]
        size -= 1
    return _magicians


magicians = ["Harry Potter", "Illyasviel von Einzbern"]
Great_magicians = make_great(magicians[:])
show_megicians(magicians)
show_megicians(Great_magicians)

Output：

    Harry Potter
    Illyasviel von Einzbern
    the Great Harry Potter
    the Great Illyasviel von Einzbern

8-14 汽车：编写一个函数，将一辆汽车的信息存储在一个字典中。这个函数总是接受制造商和型号，还接受任意数量的关键字实参。这样调用这个函数：提供必不可少的信息，以及两个名称—值对，如颜色和选装配件。这个函数必须能够像下面这样进行调用：
car = make_car('subaru', 'outback', color='blue', tow_package=True)

Solution：

def make_car(producer, _type, **car_info):
    """Make a dictionary to include all the information of a car"""
    profile = {}
    profile['producer'] = producer
    profile['type'] = _type
    for key, value in car_info.items():
        profile[key] = value
    return profile


car = make_car('subaru', 'outback', color='blue', tow_package=True)
print(car)

Output：

{'producer': 'subaru', 'type': 'outback', 'color': 'blue', 'tow_package': True}