[Python-bugs-list] [ python-Bugs-468887 ] type(self) not preserved on some methods (original) (raw)

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Sun, 07 Oct 2001 18:20:53 -0700

Bugs item #468887, was opened at 2001-10-07 18:20 You can respond by visiting: http://sourceforge.net/tracker/?func=detail&atid=105470&aid=468887&group_id=5470

Category: Type/class unification Group: Python 2.2 Status: Open Resolution: None Priority: 5 Submitted By: Mark J (average) Assigned to: Guido van Rossum (gvanrossum) Summary: type(self) not preserved on some methods

Initial Comment: 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

You can respond by visiting: http://sourceforge.net/tracker/?func=detail&atid=105470&aid=468887&group_id=5470