pyflakes fixed

sale.py

@@ -5,7 +5,6 @@
 from decimal import Decimal
 from trytond.model import fields
 from trytond.pyson import Eval
-from trytond.transaction import Transaction
 from trytond.pool import Pool, PoolMeta
 
 __all__ = ['Sale', 'SaleLine']
@@ -87,7 +86,6 @@ class SaleLine:
         Return the margin of each sale lines
         '''
         Currency = Pool().get('currency.currency')
-        res = {}
         if self.type == 'line':
             cost = Decimal(str(self.quantity)) * (self.cost_price or Decimal('0.0')) 
             amount = Decimal(str(self.quantity)) * (self.unit_price)

setup.py

@@ -5,7 +5,6 @@
 
 from setuptools import setup
 import re
-import os
 import ConfigParser
 
 config = ConfigParser.ConfigParser()

tests/test_sale_margin.py

@@ -12,9 +12,8 @@ if os.path.isdir(DIR):
 
 import unittest
 import trytond.tests.test_tryton
-from trytond.tests.test_tryton import POOL, DB_NAME, USER, CONTEXT, test_view,\
-    test_depends
-from trytond.transaction import Transaction
+from trytond.tests.test_tryton import test_view, test_depends
+
 
 class SaleMarginTestCase(unittest.TestCase):
     '''