[issue27881] Fix possible bugs when setting sqlite3.Connection.isolation_level

[Aviv Palivoda]

Aviv Palivoda added the comment:

The only change I see that can happen is that we return upper case isolation level when the user used a lower case. I think that it is worth to slow down the getter for the code simplification.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue27881>
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