[issue16231] pickle persistent_id return value

[PSchaafsma]

New submission from PSchaafsma:

The documentation of persistent_id prescribes that returning None will cause 
default pickling behavior. This makes sense.

However, in the Pickler.save function in pickle.py, the return value of 
persistent_id checked as boolean, causing also return values like 0 and [] to 
indicate default pickling.

This becomes a problem when unpickleable objects are identified by a simple 
index in some other list.

--
components: Library (Lib)
messages: 172887
nosy: pschaafsma
priority: normal
severity: normal
status: open
title: pickle persistent_id return value
type: behavior
versions: Python 2.7

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[issue16231] pickle persistent_id return value

[PSchaafsma]

PSchaafsma added the comment:

There are indeed many easy workarounds, and we definitely don't want to 
introduce any incompatibilities. 

I guess the best thing to do is just update the documentation, right?

--

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