reformatted code to pep8 convention

PowerDiagram.py

@@ -6,16 +6,12 @@
     This application takes its input from a database, currently in the form of an sql dump, but it could easily be adapted to read directly from a mysql database
 '''
 
-import sqlite3
-
-
-import os
 import re
-import sys
 import pygraphviz
 from inventory import Inventory
 from SimpaDbUtil import SqlFile, SqlDatabaseReader
 
+
 def add_capacity_constraints(capacity1, capacity2):
     """
     combines 2 capacity constraints (max amperes) together
@@ -32,6 +28,7 @@ def add_capacity_constraints(capacity1, capacity2):
         else:
             return min(capacity1, capacity2)
 
+
 class Machine(object):
     """
     represents a device with input and output power plugs. It could represent a power consumer such as a server (in which case, it has no output plug), or a power distrubtion unit (in which case, it has one input plug and more than one output plugs), or even something else...
@@ -211,7 +208,6 @@ class PowerConfig(object):
                 if power_consumption is not None:
                     machine.power_consumption = power_consumption
 
-
     def get_connection_to(self, to_plug):
         for connection in self.connections:
             if connection.to_plug == to_plug:
@@ -254,7 +250,6 @@ def power_config_to_svg( power_config, svg_file_path ):
     graph.graph_attr['overlap'] = 'false'
     graph.graph_attr['splines'] = 'true'
     
-
     graph.edge_attr['colorscheme'] = 'rdylgn9'  # 'brbg11'
     graph.node_attr['shape'] = 'box'
     graph.node_attr['height'] = 0.3  # default 0.5 inches
@@ -280,7 +275,7 @@ def power_config_to_svg( power_config, svg_file_path ):
             amperes = power_consumption / 220.0
             color = 'green'
             capacity = con.get_max_amperes()
-			if capacity == None:
+            if capacity is None:
                 label = '?'
             else:
                 label = str(capacity) + 'A'