metaclass

问题 I'm writing some code for a program that will be able to run some software, read the inputs/outputs and do some data processing along the way. For example: (this is not the real case, but just to give an idea) class MusicFile(object): extension = [""] def setup(self): #set up the data def runsoftware(self): #play the song class MP3(MusicFile): extension = [".mp3"] def setup(self): #setupMP3file def runsoftware(self): #runMP3software I have about 4 general classes, and then file extensions

问题 I'm writing some code for a program that will be able to run some software, read the inputs/outputs and do some data processing along the way. For example: (this is not the real case, but just to give an idea) class MusicFile(object): extension = [""] def setup(self): #set up the data def runsoftware(self): #play the song class MP3(MusicFile): extension = [".mp3"] def setup(self): #setupMP3file def runsoftware(self): #runMP3software I have about 4 general classes, and then file extensions

问题 I'm writing some code for a program that will be able to run some software, read the inputs/outputs and do some data processing along the way. For example: (this is not the real case, but just to give an idea) class MusicFile(object): extension = [""] def setup(self): #set up the data def runsoftware(self): #play the song class MP3(MusicFile): extension = [".mp3"] def setup(self): #setupMP3file def runsoftware(self): #runMP3software I have about 4 general classes, and then file extensions

问题 I wanted to force children to call parent constructor and found this answer which seems to do the job fine. However, I'm a bit unsure if what I'm doing is safe. I have this: # Copied from answer linked above class meta(type): def __init__(cls,name,bases,dct): def auto__call__init__(self, *a, **kw): for base in cls.__bases__: base.__init__(self, *a, **kw) cls.__init__child_(self, *a, **kw) cls.__init__child_ = cls.__init__ cls.__init__ = auto__call__init__ # My code import unittest class

问题 I wanted to force children to call parent constructor and found this answer which seems to do the job fine. However, I'm a bit unsure if what I'm doing is safe. I have this: # Copied from answer linked above class meta(type): def __init__(cls,name,bases,dct): def auto__call__init__(self, *a, **kw): for base in cls.__bases__: base.__init__(self, *a, **kw) cls.__init__child_(self, *a, **kw) cls.__init__child_ = cls.__init__ cls.__init__ = auto__call__init__ # My code import unittest class

来源： https://stackoverflow.com/questions/50555232/class-that-returns-false-with-booltheclassitself

来源： https://stackoverflow.com/questions/10445819/overriding-contains-method-for-a-class

来源： https://stackoverflow.com/questions/55309793/python-enforce-specific-method-signature-for-subclasses

来源： https://stackoverflow.com/questions/26252962/metaclass-conflict-base-class-and-derived-class-have-different-metaclass

来源： https://stackoverflow.com/questions/26252962/metaclass-conflict-base-class-and-derived-class-have-different-metaclass