Bugs item #1121475, was opened at 2005-02-12 11:48 Message generated for change (Settings changed) made by bcannon You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=105470&aid=1121475&group_id=5470
>Category: Python Library Group: Python 2.4 Status: Open Resolution: None >Priority: 5 Submitted By: S Joshua Swamidass (sswamida) Assigned to: Nobody/Anonymous (nobody) Summary: Decorated functions are unpickleable Initial Comment: The decorator feature renders functions impossible to pickle if you end up wrapping the function in either a trivial lambda or a callable class. This is a significant/artificial limitation of the decorator which should not exist and prevents decorators from being used for many of my purposes. ========================== Examples: ========================== >>> def dec(f): ... return lambda a: f(a) ... >>> @dec ... def func(a): ... return a ... >>> import pickle >>> pickle.dumps(func) Traceback (most recent call last): ... pickle.PicklingError: Can't pickle <function <lambda> at 0x40160ae4>: it's not found as __main__.<lambda> >>> class C: ... def __init__(self, f): ... self.f=f ... def __call__(self, a): ... return f(a) ... >>> def dec(f): ... return C(f) >>> @dec >>> def func(a): ... return a >>> import pickle >>> pickle.dumps(func) Traceback (most recent call last): ..... pickle.PicklingError: Can't pickle <function func at 0x40160a74>: it's not the same object as __main__.func ============================== I've found a syntacically ugly ways of working around the class wrapper bug that don't use decorators. Perhaps this could be used to create a decorator patch: ================================== >>> class C: ... def __init__(self, f): ... self.f=f ... def __call__(self, a): ... return f(a) ... >>> def _func(a): ... return a >>> func=C(_func) >>> >>> import pickle >>> pickle.dumps(func) (No error) ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=105470&aid=1121475&group_id=5470 _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
