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Wed May 4 14:37:40 EDT 2016 · https://mail.python.org/pipermail/python-dev/2016-May/144426.html

Hello,

I was recently porting my application from Py2 to Py3 and encountered
error, when I accidentally became unable to define my own pickling
mechanism for functions.
Before that I was using it to pickle pure lambdas, registering my own
handler for cPickle with copy_reg, but after [1] (and release 3.4) it seems
that feature has been removed.

As it mentioned in commit message, this was done for compatibility with
pure-python pickle. So I have to ask, may be it would be better to revert
the commit and add the corresponding feature to pure-python pickle
implementation?

[1] https://hg.python.org/cpython/rev/6bd1f0a27e8e

-- 
Best wishes,
Vsevolod Velichko
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[Python-Dev] Restore functions pickling