#31418: ValueError when FileBasedCache is used in Python 2.7
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               Reporter:  mastizada            |          Owner:  nobody
                   Type:  Bug                  |         Status:  new
              Component:  Core (Cache system)  |        Version:  2.2
               Severity:  Release blocker      |       Keywords:
           Triage Stage:  Unreviewed           |      Has patch:  0
    Needs documentation:  0                    |    Needs tests:  0
Patch needs improvement:  0                    |  Easy pickings:  0
                  UI/UX:  0                    |
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 Using FileBasedCache in Django 2.2.12 with Python 2.7.3 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.

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Ticket URL: <https://code.djangoproject.com/ticket/31418>
Django <https://code.djangoproject.com/>
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