New submission from Serhiy Storchaka:
Python 2 allows pickling and unpickling non-ascii persistent ids. In Python 3 C
implementation of pickle saves persistent ids with protocol version 0 as
utf8-encoded strings and loads as bytes.
>>> import pickle, io
>>> class MyPickler(pickle.Pickler):
... def persistent_id(self, obj):
... if isinstance(obj, str):
... return obj
... return None
...
>>> class MyUnpickler(pickle.Unpickler):
... def persistent_load(self, pid):
... return pid
...
>>> f = io.BytesIO(); MyPickler(f).dump('\u20ac'); data = f.getvalue()
>>> MyUnpickler(io.BytesIO(data)).load()
'€'
>>> f = io.BytesIO(); MyPickler(f, 0).dump('\u20ac'); data = f.getvalue()
>>> MyUnpickler(io.BytesIO(data)).load()
b'\xe2\x82\xac'
>>> f = io.BytesIO(); MyPickler(f, 0).dump('a'); data = f.getvalue()
>>> MyUnpickler(io.BytesIO(data)).load()
b'a'
Python implementation in Python 3 doesn't works with non-ascii persistant ids
at all.
----------
components: Extension Modules, Library (Lib)
messages: 186705
nosy: alexandre.vassalotti, pitrou, serhiy.storchaka
priority: normal
severity: normal
stage: needs patch
status: open
title: Persistent id in pickle with protocol version 0
type: behavior
versions: Python 3.3, Python 3.4
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Python tracker <[email protected]>
<http://bugs.python.org/issue17711>
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