Crash on Py36: sqlite3: cannot change into wal mode from within a transaction

[MarSoft]

I am using Python 3.6. When I try to launch bedup (on clean installation), I am getting this error - see traceback attached below.
According to discussion on yadayada/acd_cli#509, this issue is related to py3.6.

$ bedup scan
Traceback (most recent call last):
  File "/usr/lib/python3.6/site-packages/sqlalchemy/engine/base.py", line 2138, in _wrap_pool_connect
    return fn()
  File "/usr/lib/python3.6/site-packages/sqlalchemy/pool.py", line 328, in unique_connection
    return _ConnectionFairy._checkout(self)
  File "/usr/lib/python3.6/site-packages/sqlalchemy/pool.py", line 766, in _checkout
    fairy = _ConnectionRecord.checkout(pool)
  File "/usr/lib/python3.6/site-packages/sqlalchemy/pool.py", line 516, in checkout
    rec = pool._do_get()
  File "/usr/lib/python3.6/site-packages/sqlalchemy/pool.py", line 1045, in _do_get
    c = self._create_connection()
  File "/usr/lib/python3.6/site-packages/sqlalchemy/pool.py", line 333, in _create_connection
    return _ConnectionRecord(self)
  File "/usr/lib/python3.6/site-packages/sqlalchemy/pool.py", line 461, in __init__
    self.__connect(first_connect_check=True)
  File "/usr/lib/python3.6/site-packages/sqlalchemy/pool.py", line 663, in __connect
    pool.dispatch.connect(self.connection, self)
  File "/usr/lib/python3.6/site-packages/sqlalchemy/event/attr.py", line 256, in __call__
    fn(*args, **kw)
  File "/usr/lib/python3.6/site-packages/bedup/__main__.py", line 88, in sql_setup
    cur.execute('PRAGMA journal_mode = WAL')
sqlite3.OperationalError: cannot change into wal mode from within a transaction

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/bin/bedup", line 11, in <module>
    load_entry_point('bedup==0.10.1', 'console_scripts', 'bedup')()
  File "/usr/lib/python3.6/site-packages/bedup/__main__.py", line 497, in script_main
    sys.exit(main(sys.argv))
  File "/usr/lib/python3.6/site-packages/bedup/__main__.py", line 486, in main
    return args.action(args)
  File "/usr/lib/python3.6/site-packages/bedup/__main__.py", line 122, in vol_cmd
    sess = get_session(args)
  File "/usr/lib/python3.6/site-packages/bedup/__main__.py", line 103, in get_session
    upgrade_schema(engine)
  File "/usr/lib/python3.6/site-packages/bedup/migrations.py", line 38, in upgrade_schema
    context = MigrationContext.configure(engine.connect())
  File "/usr/lib/python3.6/site-packages/sqlalchemy/engine/base.py", line 2082, in connect
    return self._connection_cls(self, **kwargs)
  File "/usr/lib/python3.6/site-packages/sqlalchemy/engine/base.py", line 90, in __init__
    if connection is not None else engine.raw_connection()
  File "/usr/lib/python3.6/site-packages/sqlalchemy/engine/base.py", line 2168, in raw_connection
    self.pool.unique_connection, _connection)
  File "/usr/lib/python3.6/site-packages/sqlalchemy/engine/base.py", line 2142, in _wrap_pool_connect
    e, dialect, self)
  File "/usr/lib/python3.6/site-packages/sqlalchemy/engine/base.py", line 1456, in _handle_dbapi_exception_noconnection
    exc_info
  File "/usr/lib/python3.6/site-packages/sqlalchemy/util/compat.py", line 203, in raise_from_cause
    reraise(type(exception), exception, tb=exc_tb, cause=cause)
  File "/usr/lib/python3.6/site-packages/sqlalchemy/util/compat.py", line 186, in reraise
    raise value.with_traceback(tb)
  File "/usr/lib/python3.6/site-packages/sqlalchemy/engine/base.py", line 2138, in _wrap_pool_connect
    return fn()
  File "/usr/lib/python3.6/site-packages/sqlalchemy/pool.py", line 328, in unique_connection
    return _ConnectionFairy._checkout(self)
  File "/usr/lib/python3.6/site-packages/sqlalchemy/pool.py", line 766, in _checkout
    fairy = _ConnectionRecord.checkout(pool)
  File "/usr/lib/python3.6/site-packages/sqlalchemy/pool.py", line 516, in checkout
    rec = pool._do_get()
  File "/usr/lib/python3.6/site-packages/sqlalchemy/pool.py", line 1045, in _do_get
    c = self._create_connection()
  File "/usr/lib/python3.6/site-packages/sqlalchemy/pool.py", line 333, in _create_connection
    return _ConnectionRecord(self)
  File "/usr/lib/python3.6/site-packages/sqlalchemy/pool.py", line 461, in __init__
    self.__connect(first_connect_check=True)
  File "/usr/lib/python3.6/site-packages/sqlalchemy/pool.py", line 663, in __connect
    pool.dispatch.connect(self.connection, self)
  File "/usr/lib/python3.6/site-packages/sqlalchemy/event/attr.py", line 256, in __call__
    fn(*args, **kw)
  File "/usr/lib/python3.6/site-packages/bedup/__main__.py", line 88, in sql_setup
    cur.execute('PRAGMA journal_mode = WAL')
sqlalchemy.exc.OperationalError: (sqlite3.OperationalError) cannot change into wal mode from within a transaction