Description of problem:
In Python >= 3.6 

import sqlite3
sqlite3.connect("foo.db").execute('PRAGMA journal_mode k= WAL;') 

fails.

Version-Release number of selected component:
ibus-table-1.9.14-2.fc26

Additional info:
reporter:       libreport-2.9.0
cmdline:        /usr/bin/python3 /usr/share/ibus-table/engine/main.py --ibus
crash_function: __init__
exception_type: sqlite3.OperationalError
executable:     /usr/share/ibus-table/engine/main.py
kernel:         4.10.0-0.rc3.git4.1.fc26.x86_64
runlevel:       N 5
type:           Python3
uid:            1000

Truncated backtrace:
factory.py:96:do_create_engine:Exception: Cannot create engine wubi-jidian86

Traceback (most recent call last):
  File "/usr/share/ibus-table/engine/tabsqlitedb.py", line 362, in __init__
    self.db.execute('PRAGMA user_db.journal_mode = WAL;')
sqlite3.OperationalError: cannot change into wal mode from within a transaction

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/share/ibus-table/engine/factory.py", line 80, in do_create_engine
    filename = db, user_db = udb)
  File "/usr/share/ibus-table/engine/tabsqlitedb.py", line 379, in __init__
    self.init_user_db(user_db)
  File "/usr/share/ibus-table/engine/tabsqlitedb.py", line 1020, in init_user_db
    db.execute('PRAGMA journal_mode = WAL;')
sqlite3.OperationalError: cannot change into wal mode from within a transaction

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/share/ibus-table/engine/factory.py", line 96, in do_create_engine
    raise Exception("Cannot create engine %s" %engine_name)
Exception: Cannot create engine wubi-jidian86

Local variables in innermost frame:
traceback: <module 'traceback' from '/usr/lib64/python3.6/traceback.py'>
udb: 'wubi-jidian86-user.db'
db: '/usr/share/ibus-table/tables/wubi-jidian86.db'
db_dir: '/usr/share/ibus-table/tables'
path_patt: re.compile('[^a-zA-Z0-9_/]')
engine_base_path: '/com/redhat/IBus/engines/table/%s/engine/'
engine_name: 'wubi-jidian86'
self: <factory.EngineFactory object at 0x7f3388bf0d38 (factory+EngineFactory at 0x56227f91fee0)>