On 2017-10-30 15:12, Erik Bray wrote:
My point, however, is baked directly into the file format--the pickle format is very Python version-dependent (there are I think 5 different pickle formats now)
It's true that the format has changed, but always in a backward-compatible way. For basic Python objects (lists, numbers, strings, ...) I'm pretty sure that old pickles can still be unpickled correctly. The issue is with user-defined classes.
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