Pyflakes fixes.

incoterm.py

@@ -1,10 +1,8 @@
 # This file is part of Tryton.  The COPYRIGHT file at the top level of
 # this repository contains the full copyright notices and license terms.
-from trytond.model import ModelView, ModelSQL, fields
+from trytond.model import fields
 from trytond.pool import PoolMeta
 
-__all__ = ['Incoterm']
-
 
 class Incoterm(metaclass=PoolMeta):
     __name__ = 'incoterm'

party.py

@@ -2,14 +2,12 @@
 # this repository contains the full copyright notices and license terms.
 from trytond import backend
 from trytond.pool import PoolMeta, Pool
-from trytond.model import fields, ModelSQL
+from trytond.model import fields
 from trytond.pyson import Eval, Bool
 from trytond.tools.multivalue import migrate_property
 from trytond.modules.company.model import (
     CompanyMultiValueMixin, CompanyValueMixin)
 
-__all__ = ['Party', 'PartyIncoterm']
-
 purchase_incoterm = fields.Many2One('incoterm', 'Purchase Incoterm')
 purchase_incoterm_place = fields.Char('Purchase Incoterm Name Place',
         states={

purchase.py

@@ -4,8 +4,6 @@ from trytond.model import fields
 from trytond.pool import PoolMeta
 from trytond.pyson import Bool, Eval
 
-__all__ = ['Purchase']
-
 
 class Purchase(metaclass=PoolMeta):
     __name__ = 'purchase.purchase'

purchase_request.py

@@ -3,8 +3,6 @@
 from trytond.model import fields
 from trytond.pool import PoolMeta
 
-__all__ = ['PurchaseRequest', 'CreatePurchase']
-
 
 class PurchaseRequest(metaclass=PoolMeta):
     __name__ = 'purchase.request'