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Author average
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Date 2001-10-08.01:20:52
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Content 
Python-2.2a4

For user-defined types derived from built-in types, it
appears that built-in methods which return copies are
not preserving the type of self.  

>>> class Test(list): pass
>>> t=Test()
>>> map(type, [t, t[:], t+t])
[<class '__main__.Test'>, <type 'list'>, <type 'list'>]
>>> t += t
>>> type(t)
<class '__main__.Test'>

Same with types int, dictionary, etc.

Thanks,

Mark
History
Date User Action Args
2007-08-23 13:56:44adminlinkissue468887 messages
2007-08-23 13:56:44admincreate