Pyflakes fixes.

__init__.py

@@ -1,14 +1,13 @@
 # The COPYRIGHT file at the top level of this repository contains the full
 # copyright notices and license terms.
 from trytond.pool import Pool
-from .production import *
-
+from . import production
 
 def register():
     Pool.register(
-        Production,
-        SplitProductionStart,
+        production.Production,
+        production.SplitProductionStart,
         module='production_split_serial_number', type_='model')
     Pool.register(
-        SplitProduction,
+        production.SplitProduction,
         module='production_split_serial_number', type_='wizard')

production.py

@@ -5,8 +5,6 @@ from trytond.pool import Pool, PoolMeta
 from trytond.pyson import Eval, Equal
 from trytond.transaction import Transaction
 
-__all__ = ['Production', 'SplitProductionStart', 'SplitProduction']
-
 
 class Production(metaclass=PoolMeta):
     __name__ = 'production'

tests/__init__.py

@@ -1,3 +1,5 @@
 # The COPYRIGHT file at the top level of this repository contains the full
 # copyright notices and license terms.
 from .test_production_split_serial_number import suite
+
+__all__ = ['suite']