reformatted code to pep8 convention

inventory.py

@@ -1,15 +1,11 @@
 # encoding: utf-8
-import sys
-import os
-import re
 import datetime
 
-from SimpaDbUtil import SqlDatabaseReader, SqlFile
 
 class Inventory(object):
     def __init__(self, sql_reader):
         """
-        :param SqlDatabaseReader sql_reader: the inventory database
+        :param SimpaDbUtil.SqlDatabaseReader sql_reader: the inventory database
         """
         super(Inventory, self).__init__()
         self._sql_reader = sql_reader
@@ -32,7 +28,11 @@ class Inventory( object ):
         return machine_name
 
     def machine_name_to_machine_spec_id(self, machine_name):
+        # machine_spec_id = None
+        # try:
         machine_spec_id = self._sql_reader.get_table_attr('machines', 'name', machine_name, 'machine_spec_id')
+        # except:
+        #    machine_spec_id = None
         return machine_spec_id
 
     # electricity related methods
@@ -81,7 +81,6 @@ class Inventory( object ):
         ordering_date = datetime.datetime.strptime(ordering_date_as_str, '%d/%m/%Y')
         return ordering_date
 
-
     def get_cpu_dflops(self, cpu_model):
         '''
         returns the number of double precision operation per second this cpu can achieve
@@ -134,7 +133,7 @@ class Inventory( object ):
         :return float: the price of the item exluding taxes
         """
         item_price = self._sql_reader.get_table_attr('machines', 'name', item_id, 'price_ex_vat')
-        if item_price == None:
+        if item_price is None:
             item_price = 0.0
         else:
             item_price = float(item_price)
@@ -159,7 +158,7 @@ class Inventory( object ):
     
         rows = self._sql_reader.query("SELECT * FROM ownership WHERE machine_id='%s'" % item_id)
         for row in rows:
-            (machine_id, owner, owner_ratio, comment)=row
+            (machine_id, owner, owner_ratio, comment) = row  # @UnusedVariable
             ownership.append({'owner': owner, 'owner_ratio': owner_ratio})
         return ownership
 
@@ -168,8 +167,7 @@ class Inventory( object ):
     
         rows = self._sql_reader.query("SELECT * FROM machine_users")
         for row in rows:
-            (machine_id, user, user_ratio, comment)=row
+            (machine_id, user, user_ratio, comment) = row  # @UnusedVariable
             if machine_id == item_id:
                 ownership.append({'user': user, 'user_ratio': user_ratio})
         return ownership
-