a bit optimization.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@30449 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/DeliverySolver/FIFO.py

@@ -84,8 +84,9 @@ class FIFO(DeliverySolver):
     """
     Returns a list of simulation movement sorted from the last order.
     """
-    simulation_movement_list = self.simulation_movement_list[:]
+    simulation_movement_list = self.simulation_movement_list
     if len(simulation_movement_list) > 1:
-      simulation_movement_list.sort(
+      return sorted(simulation_movement_list,
         key=lambda x:x.getExplainationValue().getStartDate(), reverse=True)
-    return simulation_movement_list
+    else:
+      return simulation_movement_list

product/ERP5/DeliverySolver/LIFO.py

@@ -47,8 +47,9 @@ class LIFO(FIFO):
     """
     Returns a list of simulation movement sorted from the first order.
     """
-    simulation_movement_list = self.simulation_movement_list[:]
+    simulation_movement_list = self.simulation_movement_list
     if len(simulation_movement_list) > 1:
-      simulation_movement_list.sort(
+      return sorted(simulation_movement_list,
         key=lambda x:x.getExplainationValue().getStartDate())
-    return simulation_movement_list
+    else:
+      return simulation_movement_list

product/ERP5/DeliverySolver/MinPrice.py

@@ -72,7 +72,8 @@ class MinPrice(FIFO):
     """
     Returns a list of simulation movement sorted from the lower price.
     """
-    simulation_movement_list = self.simulation_movement_list[:]
+    simulation_movement_list = self.simulation_movement_list
     if len(simulation_movement_list) > 1:
-      simulation_movement_list.sort(key=lambda x:x.getPrice())
-    return simulation_movement_list
+      return sorted(simulation_movement_list, key=lambda x:x.getPrice())
+    else:
+      return simulation_movement_list