AttributeError:对象没有属性prin

Question

在microsoftvisualstudio中，我得到错误“Artist object has no attribute”object。我做错什么了？下面是我的python代码：

class Artist:
    def __init__(self, name):
        self.name = name
        self.albums = []

    def add_album(self, album):
        self.albums.append(album)

    def printLists(self):
        print('Songs by {}'.format(self.name))
        for alb in self.name:
            alb.printFunct('Songs by {}'.format(self.name))

class Album:
    #define what is in the album
    def __init__(self, albumTitle, artist):
        self.songs = []
        self.albumTitle = albumTitle
        artist.add_album(self)
        self.cls = albumTitle     

        artist.add_album(self)

    def addSongs(self, songTitle):
        self.songs.append(songTitle)

    def printFunct(self):
            for song in self.songs:
                print('{}({})'.format(song.nameSong, self.albumTitle))

class Song:

    def __init__(self, title, album):
        self.title = title        
        self.album = album

        album.addSongs(self)

class Playlist:
    def __init__(self, name):
        self.name = name
        self.songs = []

    def addSongs(self, song):
        self.songs.append(song)

    def printSongs(self):
        print(self.name)
        for song in self.songs:
            print('{}'.format(song.title))

hueyLewis = Artist( "Huey Lewis and the News" )
hallAndOats = Artist( "Hall and Oates" )
toto = Artist( "Toto" )
bigBamBoom = Album( "Big Bam Boom", hallAndOats )
sports = Album( "Sports", hueyLewis )
theSeventhOne = Album( "The Seventh One", toto )
four = Album( "IV", toto )

s1 = Song( "If This is it", sports )
s2 = Song( "Bad is Bad", sports )
s3 = Song( "Out of Touch", bigBamBoom )
s4 = Song( "Did it in a minute ", bigBamBoom )
s5 = Song( "Pamela", theSeventhOne )
s6 = Song( "Africa", four )


myAwesomePlaylist = Playlist( "My Awesome Playlist " )
myAwesomePlaylist.addSongs( s1 )
myAwesomePlaylist.addSongs( s2 )
myAwesomePlaylist.addSongs( s3 )
myAwesomePlaylist.addSongs( s4 )
myAwesomePlaylist.addSongs( s5 )
myAwesomePlaylist.addSongs( s6 )
hallAndOats.print('Songs by {}'.format(self.name))
hueyLewis.print('Songs by {}'.format(self.name))
toto.print('Songs by {}'.format(self.name))
myAwesomePlaylist.print()

输出应该打印出艺术家和艺术家的歌曲等

Answer 1

您没有为任何类定义print方法。因此，这些类创建的对象没有print属性。我相信这是你想要的：

hallAndOats.printLists()
hueyLewis.printLists()
toto.printLists()
myAwesomePlaylist.printSongs()

编辑

在Artist.printLists()中有两个不同的错误。该方法应该如下所示：

^{pr2}$

你在以艺术家的名义而不是艺术家制作的专辑中迭代单个角色。另外，您错误地调用了Album.printFunct()。正如您定义的那样，它没有任何显式参数，但是您是用'Songs by {}'.format(self.name)作为显式参数来调用它的。在

编辑2

您的代码中还有一个错误，但这次是Album.printFunct()。该方法应该如下所示：

def printFunct(self):
    for song in self.songs:
        print('{}({})'.format(song.title, self.albumTitle))

您使用的是song.nameSong，它在代码中没有其他地方出现（至少是作为Song的实例变量）。在

编辑3

您在Album.__init__中有另一个错误。您将每个专辑添加到每个艺术家两次。从Album构造函数中删除一个artist.add_album(self)以修复此问题。在

Answer 2

我相信错误是从这里来的：

hallAndOats.print('Songs by {}'.format(self.name))
hueyLewis.print('Songs by {}'.format(self.name))
toto.print('Songs by {}'.format(self.name))
myAwesomePlaylist.print()

你应该用

.Artist类的打印列表

.printFunct用于类“Album”和

。为类“Playlist”打印歌曲

只能使用在类中定义的函数。希望有帮助。：）

Answer 3

您的错误告诉您：艺术家对象没有print属性。他们有printLists。只需将最后几行更改为使用printLists，而不是print。但是，播放列表应该是printSongs。在