[docs] [issue8145] Documentation about sqlite3 isolation_level

[Berker Peksag]

Berker Peksag added the comment:

The patch needs to be updated to address changes in issue 10740 so I'm moving the stage field back to 'patch review'.

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stage: commit review -> patch review
versions: +Python 3.7

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue8145>
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