On 7/19/2012 9:54 PM, Antoine Pitrou wrote:
On Thu, 19 Jul 2012 19:53:27 +0300
M Stefan <mstefa...@gmail.com> wrote:
Hey,
As part of pickle4, I found it interesting to add the possibility
of pickling bound functions (instance methods). This is done by
pickling f.__self__ and f.__func__ separately, and then adding
a BIND opcode to tie them together.
Instead of a specific opcode, can't you use a suitable __reduce__ magic
(or __getnewargs__, perhaps)? We want to limit the number of opcodes
except for performance-critical types (and I don't think bound methods
are performance-critical for the purpose of serialization).
Yes, I agree that doing it with __reduce__ would be better approach than
adding a new opcode, I'll consider switching.
I have created a patch at [1], which adds __func__ to some other
function types, as well as:
1) adds AllFunctionTypes etc. to Lib/types.py
2) inspect.isanyfunction(), inspect.isanyboundfunction(),
inspect.isanyunboundfunction()
3) functools.unbind
That sounds like a lot of changes if the goal is simply to make those
types picklable.
Regards
Antoine.
Indeed they are, I just thought there may be a chance this code would be
used elsewhere
too. It's a bit weird that you can use inspect to check for certain
types of functions but
not others, as well as be able to "unbind" certain types of methods but
not others.
Admittedly, these changes have little use-case and are not a priority.
Yours,
Stefan M
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