New submission from Florian Schulze:

Using:

conn = sqlite3.connect(':memory:', isolation_level='IMMEDIATE')
conn.execute('begin immediate')

Throws:

sqlite3.OperationalError: cannot start a transaction within a transaction

This didn't happen in previous versions and the conn.in_transaction attribute 
is False right before the call to execute, so this situation doesn't seem to be 
detectable upfront for backward compatibility.

----------
components: Library (Lib)
messages: 279301
nosy: fschulze
priority: normal
severity: normal
status: open
title: execute("begin immediate") throwing OperationalError
type: behavior
versions: Python 3.6

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue28518>
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