這裏調用父類的方法,是我的代碼:蟒蛇 - 似乎無法從孩子
from mutagen.easyid3 import EasyID3
from mutagen import File
class MusicFile:
"""A class representing a particular music file.
Children that are intended to be instantiated must initialize fields for
the getters that exist in this class.
"""
def __init__(self, location):
self.location = location
def getLocation():
return self.location
def getArtist():
return self.artist
def getAlbum():
return self.album
def getTitle():
return self.title
###############################################################################
class LossyMusicFile(MusicFile):
"""A class representing a lossy music file.
Contains all functionality required by only lossy music files. To date, that
is processing bitrates into a standard number and returning format with
bitrate.
"""
def __init__(self, location):
super().__init__(location)
def parseBitrate(br):
"""Takes a given precise bitrate value and rounds it to the closest
standard bitrate.
Standard bitrate varies by specific filetype and is to be set by the
child.
"""
prevDiff=999999999
for std in self.bitrates:
# As we iterate through the ordered list, difference should be
# getting smaller and smaller as we tend towards the best rounding
# value. When the difference gets bigger, we know the previous one
# was the closest.
diff = abs(br-std)
if diff>prevDiff:
return prev
prevDiff = diff
prev = std
def getFormat():
"""Return the format as a string.
look like the format name (a class variable in the children), followed
by a slash, followed by the bitrate in kbps (an instance variable in the
children). a 320kbps mp3 would be 'mp3/320'.
"""
return self.format + '/' + self.bitrate
###############################################################################
class Mp3File(LossyMusicFile):
"""A class representing an mp3 file."""
format = "mp3"
# Threw a large value on the end so parseBitrate() can iterate after the end
bitrates = (32000, 40000, 48000, 56000, 64000, 80000, 96000, 112000,
128000, 160000, 192000, 224000, 256000, 320000, 999999)
def __init__(self, location):
super().__init__(location)
id3Info = EasyID3(location)
self.artist = id3Info['artist'][0]
self.album = id3Info['album'][0]
self.title = id3Info['title'][0]
# Once we set it here, bitrate shall be known in kbps
self.bitrate = (self.parseBitrate(File(location).info.bitrate))/1000
現在,當我嘗試實例化一個Mp3File
,它給了我一個錯誤上的最後一行Mp3File.__init__()
:
line 113, in __init__
self.bitrate = (self.parseBitrate(File(location).info.bitrate))/1000
NameError: name 'parseBitrate' is not defined
然而,在我看來,它應該沒有找對方法在Mp3File
,然後尋找父類,LossyMusicFile
,如果它確實存在的方法。
我試着將這一行改爲self.bitrate = (super().parseBitrate(File(location).info.bitrate))/1000
,這樣它會明確地使用父類的方法,但是我得到了同樣的錯誤。這是怎麼回事?
如果以前有人問過這個問題,或者是一個愚蠢的問題,但是我找不到它,當我搜索時,我實際上是愚蠢的。
所有的實例方法**都必須具有'self'作爲第一個參數。 – James
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