[issue41238] Python 3 shelve.DbfilenameShelf is generating 164 times larger files than Python 2.7 when storing dicts

Change by Jeffrey Kintscher : -- nosy: +Jeffrey.Kintscher ___ Python tracker ___ ___ Python-bugs-list mailing list Unsubscribe:

[issue41238] Python 3 shelve.DbfilenameShelf is generating 164 times larger files than Python 2.7 when storing dicts

Paweł Miech added the comment: Ok so I see this is an issue that involves the way Pickle pickles Python set objects. Updated script to reproduce appended. Apparently, sets are becoming much larger when stored in Python3 pickle. -- Added file:

[issue41238] Python 3 shelve.DbfilenameShelf is generating 164 times larger files than Python 2.7 when storing dicts

New submission from Paweł Miech : I'm porting some code from Python 2.7 to Python 3.8. There is some code that is using shelve.DbfilenameShelf to store some nested dictionaries with sets. I found out that compared with Python 2.7 Python 3.8 shelve generates files that are approximately 164