ignore false positive E231 missing whitespace flake8 warnings

https://flake8.pycqa.org/en/3.0.1/user/ignoring-errors.html#in-line-ignoring-errors

treedb/backend/export.py

@@ -114,7 +114,7 @@ def progress(status, remaining, total):
         log.info('%d of %d pages copied', total - remaining, total)
 
     with contextlib.closing(engine.raw_connection()) as source_fairy,\
-         contextlib.closing(result.raw_connection()) as dest_fairy:
+         contextlib.closing(result.raw_connection()) as dest_fairy:  # noqa: E231
         log.debug('sqlite3.backup(%r)', dest_fairy.driver_connection)
 
         dest_fairy.execute('PRAGMA synchronous = OFF')
@@ -150,7 +150,7 @@ def dump_sql(filename=None, /, *,
 
     n = 0
     with contextlib.closing(engine.raw_connection()) as dbapi_fairy,\
-         open_path('wt', encoding=encoding) as f:
+         open_path('wt', encoding=encoding) as f:  # noqa: E231
         for n, line in enumerate(dbapi_fairy.iterdump(), start=1):
             print(line, file=f)
             if not (n % progress_after):
@@ -184,7 +184,7 @@ def csv_zipfile(filename=None, /, *, exclude_raw: bool = False,
 
     log.info('write %r', filename)
     with _backend.connect(bind=engine) as conn,\
-         zipfile.ZipFile(filename, 'w', zipfile.ZIP_DEFLATED) as z:
+         zipfile.ZipFile(filename, 'w', zipfile.ZIP_DEFLATED) as z:  # noqa: E231
         for table in sorted_tables:
             if table.name in skip:
                 log.debug('skip table %r', table.name)

treedb/raw/records.py

@@ -135,5 +135,5 @@ def iterkeys(key_column, /, *, size: int = WINDOWSIZE,
               size, str(key_column.expression))
 
     with _backend.connect(bind=bind) as conn,\
-         contextlib.closing(conn.execute(select_keys)) as result:
+         contextlib.closing(conn.execute(select_keys)) as result:  # noqa: E231
         yield from result.scalars()