Add python 3 support

bom.py

@@ -9,7 +9,6 @@ __all__ = [
     'BOMInputExtraProduct', 'BOMOutputExtraProduct',
     'BOMInput', 'BOMOutput',
     ]
-__metaclass__ = PoolMeta
 
 
 class BOMInputExtraProduct(ModelSQL, ModelView, ExtraProductMixin):
@@ -27,6 +26,7 @@ class BOMOutputExtraProduct(ModelSQL, ModelView, ExtraProductMixin):
 
 
 class BOMInput:
+    __metaclass__ = PoolMeta
     __name__ = 'production.bom.input'
     extra_products = fields.One2Many('production.bom.input.extra_product',
         'bom_input', 'Extra products',
@@ -38,6 +38,7 @@ class BOMInput:
 
 
 class BOMOutput:
+    __metaclass__ = PoolMeta
     __name__ = 'production.bom.output'
     extra_products = fields.One2Many('production.bom.output.extra_product',
         'bom_output', 'Extra products',

move.py

@@ -8,7 +8,6 @@ from trytond.transaction import Transaction
 from trytond.pool import Pool, PoolMeta
 __all__ = ['MoveExtraProduct', 'Move']
 
-__metaclass__ = PoolMeta
 
 STATES = {
     'readonly': In(Eval('state'), ['cancel', 'assigned', 'done']),
@@ -151,6 +150,7 @@ class MoveExtraProduct(ModelSQL, ModelView, ExtraProductMixin):
 
 
 class Move:
+    __metaclass__ = PoolMeta
     __name__ = 'stock.move'
     extra_products = fields.One2Many('stock.move.extra_product', 'move',
         'Extra products',

production.py

@@ -10,10 +10,10 @@ from trytond.pool import Pool, PoolMeta
 from trytond.modules.product import price_digits
 
 __all__ = ['Production', 'AddExtraProductBOMStart', 'AddExtraProductBOM']
-__metaclass__ = PoolMeta
 
 
 class Production:
+    __metaclass__ = PoolMeta
     __name__ = "production"
     extra_products_cost = fields.Function(fields.Numeric('Extra Product Cost',
         digits=price_digits), 'on_change_with_extra_products_cost')

purchase_request.py

@@ -4,10 +4,10 @@
 from trytond.pool import PoolMeta
 
 __all__ = ['PurchaseRequest']
-__metaclass__ = PoolMeta
 
 
 class PurchaseRequest:
+    __metaclass__ = PoolMeta
     __name__ = 'purchase.request'
 
     @classmethod

shipment.py

@@ -4,10 +4,9 @@
 from trytond.pool import Pool, PoolMeta
 __all__ = ['ShipmentOut']
 
-__metaclass__ = PoolMeta
-
 
 class ShipmentOut:
+    __metaclass__ = PoolMeta
     __name__ = 'stock.shipment.out'
 
     def _get_inventory_move(self, move):