[issue7689] Pickling of classes with a metaclass and copy_reg
Gerald Dalley
report at bugs.python.org
Wed Jun 16 22:49:34 CEST 2010
Gerald Dalley <dalleyg at deshaw.com> added the comment:
Another use case: for distributed processing, it's handy to be able to pickle interactive functions and functions that are part of a script. The user can then remotely execute a broader set of functions than can be pickled by default. This is especially helpful for interactive exploration of data.
Pickling most types of functions is possible by serializing a function's bytecode, etc. and registering a handler with copy_reg. Unfortunately, this handler is ignored under some conditions (e.g. copy_reg is ignored when attempting to serialize top-level functions in a script) but the copy_reg handler does get used for lambdas and inner functions. This patch looks like it will allow FunctionType's pickle handler to be overridden in all cases.
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nosy: +dalleyg
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