pep8 cleaning

src/sage/geometry/polyhedron/constructor.py

@@ -175,8 +175,8 @@
 
     sage: triangle = Polyhedron([(0,0), (1,0), (1/2, sqrt(3)/2)], base_ring=AA)
     sage: triangle.Hrepresentation()
-    (An inequality (-1, -0.5773502691896258?) x + 1 >= 0, 
-     An inequality (1, -0.5773502691896258?) x + 0 >= 0, 
+    (An inequality (-1, -0.5773502691896258?) x + 1 >= 0,
+     An inequality (1, -0.5773502691896258?) x + 0 >= 0,
      An inequality (0, 1.154700538379252?) x + 0 >= 0)
 
 Without specifying the ``base_ring``, the ``sqrt(3)`` would be a
@@ -196,7 +196,7 @@
 
     sage: K.<sqrt3> = NumberField(x^2-3)
     sage: Polyhedron([(0,0), (1,0), (1/2, sqrt3/2)])
-    A 2-dimensional polyhedron in (Number Field in sqrt3 with defining 
+    A 2-dimensional polyhedron in (Number Field in sqrt3 with defining
     polynomial x^2 - 3)^2 defined as the convex hull of 3 vertices
 
 If the input consists of decimal numbers and the `base_ring` is not specified,
@@ -518,7 +518,7 @@ def Polyhedron(vertices=None, rays=None, lines=None,
                     convert = True
 
     # Add the origin if necesarry
-    if got_Vrep and len(vertices)==0:
+    if got_Vrep and len(vertices) == 0:
         vertices = [ [0]*ambient_dim ]
 
     # Specific backends can override the base_ring