diff --git a/examples/consoles.py b/examples/consoles.py
index 2a0c195..698a242 100755
--- a/examples/consoles.py
+++ b/examples/consoles.py
@@ -252,7 +252,7 @@ class Graph( Frame ):
         x1 = x0 + self.barwidth
         y0 = self.gheight
         y1 = ( 1 - percent ) * self.gheight
-        c.create_rectangle( x0 , y0, x1, y1, fill='green' )
+        c.create_rectangle( x0, y0, x1, y1, fill='green' )
         self.xpos += 1
         self.updateScrollRegions()
         self.graph.xview( 'moveto', '1.0' )
diff --git a/examples/miniedit.py b/examples/miniedit.py
index 900b94a..2889533 100755
--- a/examples/miniedit.py
+++ b/examples/miniedit.py
@@ -289,7 +289,7 @@ class MiniEdit( Frame ):
     def deleteItem( self, item ):
         "Delete an item."
         # Don't delete while network is running
-        if self.buttons[ 'Select' ][ 'state' ] == 'disabled' :
+        if self.buttons[ 'Select' ][ 'state' ] == 'disabled':
             return
         # Delete from model
         if item in self.links:
diff --git a/examples/multiping.py b/examples/multiping.py
index ac8aed5..bb53526 100755
--- a/examples/multiping.py
+++ b/examples/multiping.py
@@ -18,7 +18,7 @@ from time import time
 
 def chunks( l, n ):
     "Divide list l into chunks of size n - thanks Stackoverflow"
-    return [ l[ i : i + n ] for i in range( 0, len( l ), n ) ]
+    return [ l[ i: i + n ] for i in range( 0, len( l ), n ) ]
 
 def startpings( host, targetips ):
     "Tell host to repeatedly ping targets"
diff --git a/mininet/node.py b/mininet/node.py
index afc58ce..b06c910 100644
--- a/mininet/node.py
+++ b/mininet/node.py
@@ -167,7 +167,7 @@ class Node( object ):
         if '\n' not in self.readbuf:
             return None
         pos = self.readbuf.find( '\n' )
-        line = self.readbuf[ 0 : pos ]
+        line = self.readbuf[ 0: pos ]
         self.readbuf = self.readbuf[ pos + 1: ]
         return line