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I'm using Python 3.6.0 RC2.
When I try to run VACUUM command, an exception raised:
conn.execute('begin') # <- remove this line get the same result
conn.execute('VACUUM')
sqlite3.OperationalError: cannot VACUUM from within a transaction
On Python 3.5, everything is fine.
Attached file cant_vacuum.py is the full example code.
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related issue: #10740 sqlite3 module breaks transactions and potentially corrupts data
R. David Murray said in #10740 about this issue:
It is an unexpected change in behavior and is therefore probably a bug. It will work if you set isolation_level=None. Because of that I don't think it is a release critical bug, though one could wish we'd discovered it earlier.