Changes between Initial Version and Version 1 of Ticket #31418, comment 6


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Timestamp:
Apr 2, 2020, 11:05:31 AM (4 years ago)
Author:
Simon Charette

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  • Ticket #31418, comment 6

    initial v1  
    11Python 3.8 introduced [https://www.python.org/dev/peps/pep-0574/ pickle protocol 5] and pointed `pickle.HIGHEST_PROTOCOL` at it. You most likely ran your project on Python 3.8 and stored things in a cache using the `FileBasedCache` backend and then tried running your project on Python 3.7.
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    3 If you're in process of migrating from 3.7 to 3.8 you'll likely want to subclass `FileBasedCache` and set its `pickle_protocol` to `4` and use it as your backend during the transition period. When you've fully migrated to Python 3.8 you can swap back to `FileBasedCache`.
     3If you're in the process of migrating from 3.7 to 3.8 you'll likely want to subclass `FileBasedCache` and set its `pickle_protocol` to `4` and use it as your backend during the transition period. When you've fully migrated to Python 3.8 you can swap back to `FileBasedCache`.
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    5 I had to do similar manipulations when moving projects from Python 2 to 3 which makes me wonder if we should add a `CACHE_PICKLE_PROTOCOL` setting or allow to specify it via `CACHES['OPTIONS']` to avoid having to subclassing backends when such a transition is required. This is likely to be more of an issue as more and more people migrate to 3.8.
     5I had to do similar manipulations when moving projects from Python 2 to 3 which makes me wonder if we should add a `CACHE_PICKLE_PROTOCOL` setting or allow to specify it via `CACHES['OPTIONS']` to avoid having to subclass backends when such a transition is required. This is likely to be more of an issue as more and more people migrate to 3.8.
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