Opened 5 years ago

Closed 5 years ago

Last modified 5 years ago

#31418 closed Bug (invalid)

ValueError when FileBasedCache is used in Python 3.7 — at Version 4

Reported by: mastizada Owned by: nobody
Component: Core (Cache system) Version: 2.2
Severity: Release blocker Keywords:
Cc: Triage Stage: Unreviewed
Has patch: no Needs documentation: no
Needs tests: no Patch needs improvement: no
Easy pickings: no UI/UX: no

Description (last modified by mastizada)

Using FileBasedCache in Django 2.2.12 with Python 3.7.3 is giving ValueError: unsupported pickle protocol: 5

Checking the highest protocol version for pickle using pickle.HIGHEST_PROTOCOL is giving 4, so the protocol 5 is not available.

Line that is causing the error: filebased.py in _is_expired at line 146, exp = pickle.load(f).

Using Python 3.8.0 solves the problem.

Change History (4)

comment:2 by Carlton Gibson, 5 years ago

Resolution: → invalid
Status: new → closed

Django 1.11 was the last version of Django to support Python 2.7

comment:3 by Simon Charette, 5 years ago

You likely serialized data using Python 3 and are trying to deserialize it using Python 2. Django 2.2 also doesn't support Python 2 at all.

comment:4 by mastizada, 5 years ago

Description: modified (diff)
Summary: ValueError when FileBasedCache is used in Python 2.7 → ValueError when FileBasedCache is used in Python 3.7

Indicated the wrong python version

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