Code cleanup: pep8

8 files changed, 221 insertions, 42 deletions

diff --git a/release/scripts/freestyle/modules/freestyle/chainingiterators.py b/release/scripts/freestyle/modules/freestyle/chainingiterators.py
index aad82d16bd2..4b2cc9a832c 100644
--- a/release/scripts/freestyle/modules/freestyle/chainingiterators.py
+++ b/release/scripts/freestyle/modules/freestyle/chainingiterators.py
@@ -54,8 +54,10 @@ class pyChainSilhouetteIterator(ChainingIterator):
     """
     def __init__(self, stayInSelection=True):
         ChainingIterator.__init__(self, stayInSelection, True, None, True)
+
     def init(self):
         pass
+
     def traverse(self, iter):
         winner = None
         it = AdjacencyIterator(iter)
@@ -110,8 +112,10 @@ class pyChainSilhouetteGenericIterator(ChainingIterator):
 
     def __init__(self, stayInSelection=True, stayInUnvisited=True):
         ChainingIterator.__init__(self, stayInSelection, stayInUnvisited, None, True)
+
     def init(self):
         pass
+
     def traverse(self, iter):
         winner = None
         it = AdjacencyIterator(iter)
@@ -161,9 +165,11 @@ class pyExternalContourChainingIterator(ChainingIterator):
     def __init__(self):
         ChainingIterator.__init__(self, False, True, None, True)
         self._isExternalContour = ExternalContourUP1D()
+
     def init(self):
         self._nEdges = 0
         self._isInSelection = 1
+
     def checkViewEdge(self, ve, orientation):
         if orientation != 0:
             vertex = ve.second_svertex()
@@ -178,6 +184,7 @@ class pyExternalContourChainingIterator(ChainingIterator):
         if bpy.app.debug_freestyle:
             print("pyExternalContourChainingIterator : didn't find next edge")
         return False
+
     def traverse(self, iter):
         winner = None
         it = AdjacencyIterator(iter)
@@ -218,8 +225,10 @@ class pySketchyChainSilhouetteIterator(ChainingIterator):
         ChainingIterator.__init__(self, stayInSelection, False, None, True)
         self._timeStamp = CF.get_time_stamp()+nRounds
         self._nRounds = nRounds
+
     def init(self):
         self._timeStamp = CF.get_time_stamp()+self._nRounds
+
     def traverse(self, iter):
         winner = None
         it = AdjacencyIterator(iter)
@@ -277,8 +286,10 @@ class pySketchyChainingIterator(ChainingIterator):
         ChainingIterator.__init__(self, stayInSelection, False, None, True)
         self._timeStamp = CF.get_time_stamp()+nRounds
         self._nRounds = nRounds
+
     def init(self):
         self._timeStamp = CF.get_time_stamp()+self._nRounds
+
     def traverse(self, iter):
         winner = None
         found = False
@@ -316,10 +327,12 @@ class pyFillOcclusionsRelativeChainingIterator(ChainingIterator):
         ChainingIterator.__init__(self, False, True, None, True)
         self._length = 0
         self._percent = float(percent)
+
     def init(self):
         # A chain's length should preferably be evaluated only once.
         # Therefore, the chain length is reset here.
         self._length = 0
+
     def traverse(self, iter):
         winner = None
 
@@ -414,8 +427,10 @@ class pyFillOcclusionsAbsoluteChainingIterator(ChainingIterator):
     def __init__(self, length):
         ChainingIterator.__init__(self, False, True, None, True)
         self._length = float(length)
+
     def init(self):
         pass
+
     def traverse(self, iter):
         winner = None
         winnerOrientation = False
@@ -481,11 +496,13 @@ class pyFillOcclusionsAbsoluteAndRelativeChainingIterator(ChainingIterator):
         self._length = 0
         self._absLength = l
         self._percent = float(percent)
+
     def init(self):
         # each time we're evaluating a chain length
         # we try to do it once. Thus we reinit
         # the chain length here:
         self._length = 0
+
     def traverse(self, iter):
         winner = None
         winnerOrientation = False
@@ -581,10 +598,12 @@ class pyFillQi0AbsoluteAndRelativeChainingIterator(ChainingIterator):
         self._length = 0
         self._absLength = l
         self._percent = float(percent)
+
     def init(self):
         # A chain's length should preverably be evaluated only once.
         # Therefore, the chain length is reset here.
         self._length = 0
+
     def traverse(self, iter):
         winner = None
         winnerOrientation = False
@@ -682,8 +701,10 @@ class pyNoIdChainSilhouetteIterator(ChainingIterator):
 
     def __init__(self, stayInSelection=True):
         ChainingIterator.__init__(self, stayInSelection, True, None, True)
+
     def init(self):
         pass
+
     def traverse(self, iter):
         winner = None
         it = AdjacencyIterator(iter)
diff --git a/release/scripts/freestyle/modules/freestyle/functions.py b/release/scripts/freestyle/modules/freestyle/functions.py
index 686dce6615f..379e933862c 100644
--- a/release/scripts/freestyle/modules/freestyle/functions.py
+++ b/release/scripts/freestyle/modules/freestyle/functions.py
@@ -94,6 +94,7 @@ from mathutils import Vector
 ## Functions for 0D elements (vertices)
 #######################################
 
+
 class CurveMaterialF0D(UnaryFunction0DMaterial):
     """
     A replacement of the built-in MaterialF0D for stroke creation.
@@ -106,18 +107,21 @@ class CurveMaterialF0D(UnaryFunction0DMaterial):
         assert(fe is not None)
         return fe.material if fe.is_smooth else fe.material_left
 
+
 class pyInverseCurvature2DAngleF0D(UnaryFunction0DDouble):
     def __call__(self, inter):
         func = Curvature2DAngleF0D()
         c = func(inter)
         return (3.1415 - c)
 
+
 class pyCurvilinearLengthF0D(UnaryFunction0DDouble):
     def __call__(self, inter):
         cp = inter.object
         assert(isinstance(cp, CurvePoint))
         return cp.t2d
 
+
 class pyDensityAnisotropyF0D(UnaryFunction0DDouble):
     """Estimates the anisotropy of density"""
     def __init__(self,level):
@@ -127,6 +131,7 @@ class pyDensityAnisotropyF0D(UnaryFunction0DDouble):
         self.d1Density = ReadSteerableViewMapPixelF0D(1, level)
         self.d2Density = ReadSteerableViewMapPixelF0D(2, level)
         self.d3Density = ReadSteerableViewMapPixelF0D(3, level)
+
     def __call__(self, inter):
         c_iso = self.IsoDensity(inter)
         c_0 = self.d0Density(inter)
@@ -141,6 +146,7 @@ class pyDensityAnisotropyF0D(UnaryFunction0DDouble):
             v = (cMax-cMin)/c_iso
         return v
 
+
 class pyViewMapGradientVectorF0D(UnaryFunction0DVec2f):
     """Returns the gradient vector for a pixel
 
@@ -151,6 +157,7 @@ class pyViewMapGradientVectorF0D(UnaryFunction0DVec2f):
         UnaryFunction0DVec2f.__init__(self)
         self._l = level
         self._step = pow(2, self._l)
+
     def __call__(self, iter):
         p = iter.object.point_2d
         gx = CF.read_complete_view_map_pixel(self._l, int(p.x+self._step), int(p.y)) - \
@@ -159,11 +166,13 @@ class pyViewMapGradientVectorF0D(UnaryFunction0DVec2f):
             CF.read_complete_view_map_pixel(self._l, int(p.x), int(p.y))
         return Vector((gx, gy))
 
+
 class pyViewMapGradientNormF0D(UnaryFunction0DDouble):
     def __init__(self, l):
         UnaryFunction0DDouble.__init__(self)
         self._l = l
         self._step = pow(2,self._l)
+
     def __call__(self, iter):
         p = iter.object.point_2d
         gx = CF.read_complete_view_map_pixel(self._l, int(p.x+self._step), int(p.y)) - \
@@ -176,34 +185,40 @@ class pyViewMapGradientNormF0D(UnaryFunction0DDouble):
 ## Functions for 1D elements (curves)
 #####################################
 
+
 class pyGetInverseProjectedZF1D(UnaryFunction1DDouble):
     def __call__(self, inter):
         func = GetProjectedZF1D()
         z = func(inter)
         return (1.0 - z)
 
+
 class pyGetSquareInverseProjectedZF1D(UnaryFunction1DDouble):
     def __call__(self, inter):
         func = GetProjectedZF1D()
         z = func(inter)
         return (1.0 - z*z)
 
+
 class pyDensityAnisotropyF1D(UnaryFunction1DDouble):
     def __init__(self,level,  integrationType=IntegrationType.MEAN, sampling=2.0):
         UnaryFunction1DDouble.__init__(self, integrationType)
         self._func = pyDensityAnisotropyF0D(level)
         self._integration = integrationType
         self._sampling = sampling
+
     def __call__(self, inter):
         v = integrate(self._func, inter.points_begin(self._sampling), inter.points_end(self._sampling), self._integration)
         return v
 
+
 class pyViewMapGradientNormF1D(UnaryFunction1DDouble):
     def __init__(self,l, integrationType, sampling=2.0):
         UnaryFunction1DDouble.__init__(self, integrationType)
         self._func = pyViewMapGradientNormF0D(l)
         self._integration = integrationType
         self._sampling = sampling
+
     def __call__(self, inter):
         v = integrate(self._func, inter.points_begin(self._sampling), inter.points_end(self._sampling), self._integration)
         return v
diff --git a/release/scripts/freestyle/modules/freestyle/predicates.py b/release/scripts/freestyle/modules/freestyle/predicates.py
index ab702f1c290..08017953c35 100644
--- a/release/scripts/freestyle/modules/freestyle/predicates.py
+++ b/release/scripts/freestyle/modules/freestyle/predicates.py
@@ -80,29 +80,35 @@ class pyHigherCurvature2DAngleUP0D(UnaryPredicate0D):
     def __init__(self,a):
         UnaryPredicate0D.__init__(self)
         self._a = a
+
     def __call__(self, inter):
         func = Curvature2DAngleF0D()
         a = func(inter)
         return (a > self._a)
 
+
 class pyUEqualsUP0D(UnaryPredicate0D):
     def __init__(self,u, w):
         UnaryPredicate0D.__init__(self)
         self._u = u
         self._w = w
+
     def __call__(self, inter):
         func = pyCurvilinearLengthF0D()
         u = func(inter)
         return (u > (self._u-self._w)) and (u < (self._u+self._w))
 
+
 class pyVertexNatureUP0D(UnaryPredicate0D):
     def __init__(self,nature):
         UnaryPredicate0D.__init__(self)
         self._nature = nature
+
     def __call__(self, inter):
         v = inter.object
         return (v.nature & self._nature) != 0
 
+
 ## check whether an Interface0DIterator
 ## is a TVertex and is the one that is
 ## hidden (inferred from the context)
@@ -110,6 +116,7 @@ class pyBackTVertexUP0D(UnaryPredicate0D):
     def __init__(self):
         UnaryPredicate0D.__init__(self)
         self._getQI = QuantitativeInvisibilityF0D()
+
     def __call__(self, iter):
         if (iter.object.nature & Nature.T_VERTEX) == 0:
             return False
@@ -119,20 +126,24 @@ class pyBackTVertexUP0D(UnaryPredicate0D):
             return True
         return False
 
+
 class pyParameterUP0DGoodOne(UnaryPredicate0D):
     def __init__(self,pmin,pmax):
         UnaryPredicate0D.__init__(self)
         self._m = pmin
         self._M = pmax
+
     def __call__(self, inter):
         u = inter.u
         return ((u>=self._m) and (u<=self._M))
 
+
 class pyParameterUP0D(UnaryPredicate0D):
     def __init__(self,pmin,pmax):
         UnaryPredicate0D.__init__(self)
         self._m = pmin
         self._M = pmax
+
     def __call__(self, inter):
         func = Curvature2DAngleF0D()
         c = func(inter)
@@ -144,62 +155,76 @@ class pyParameterUP0D(UnaryPredicate0D):
 ## Unary predicates for 1D elements (curves)
 ############################################
 
+
 class AndUP1D(UnaryPredicate1D):
     def __init__(self, pred1, pred2):
         UnaryPredicate1D.__init__(self)
         self.__pred1 = pred1
         self.__pred2 = pred2
+
     def __call__(self, inter):
         return self.__pred1(inter) and self.__pred2(inter)
 
+
 class OrUP1D(UnaryPredicate1D):
     def __init__(self, pred1, pred2):
         UnaryPredicate1D.__init__(self)
         self.__pred1 = pred1
         self.__pred2 = pred2
+
     def __call__(self, inter):
         return self.__pred1(inter) or self.__pred2(inter)
 
+
 class NotUP1D(UnaryPredicate1D):
     def __init__(self, pred):
         UnaryPredicate1D.__init__(self)
         self.__pred = pred
+
     def __call__(self, inter):
         return not self.__pred(inter)
 
+
 class pyNFirstUP1D(UnaryPredicate1D):
     def __init__(self, n):
         UnaryPredicate1D.__init__(self)
         self.__n = n
         self.__count = 0
+
     def __call__(self, inter):
         self.__count = self.__count + 1
         if self.__count <= self.__n:
             return True
         return False
 
+
 class pyHigherLengthUP1D(UnaryPredicate1D):
     def __init__(self,l):
         UnaryPredicate1D.__init__(self)
         self._l = l
+
     def __call__(self, inter):
         return (inter.length_2d > self._l)
 
+
 class pyNatureUP1D(UnaryPredicate1D):
     def __init__(self,nature):
         UnaryPredicate1D.__init__(self)
         self._nature = nature
         self._getNature = CurveNatureF1D()
+
     def __call__(self, inter):
         if(self._getNature(inter) & self._nature):
             return True
         return False
 
+
 class pyHigherNumberOfTurnsUP1D(UnaryPredicate1D):
     def __init__(self,n,a):
         UnaryPredicate1D.__init__(self)
         self._n = n
         self._a = a
+
     def __call__(self, inter):
         count = 0
         func = Curvature2DAngleF0D()
@@ -212,72 +237,85 @@ class pyHigherNumberOfTurnsUP1D(UnaryPredicate1D):
             it.increment()
         return False
 
+
 class pyDensityUP1D(UnaryPredicate1D):
-    def __init__(self,wsize,threshold, integration = IntegrationType.MEAN, sampling=2.0):
+    def __init__(self, wsize, threshold, integration=IntegrationType.MEAN, sampling=2.0):
         UnaryPredicate1D.__init__(self)
         self._wsize = wsize
         self._threshold = threshold
         self._integration = integration
         self._func = DensityF1D(self._wsize, self._integration, sampling)
+
     def __call__(self, inter):
         return (self._func(inter) < self._threshold)
 
+
 class pyLowSteerableViewMapDensityUP1D(UnaryPredicate1D):
-    def __init__(self,threshold, level,integration = IntegrationType.MEAN):
+    def __init__(self, threshold, level, integration=IntegrationType.MEAN):
         UnaryPredicate1D.__init__(self)
         self._threshold = threshold
         self._level = level
         self._integration = integration
+
     def __call__(self, inter):
         func = GetSteerableViewMapDensityF1D(self._level, self._integration)
         return (func(inter) < self._threshold)
 
+
 class pyLowDirectionalViewMapDensityUP1D(UnaryPredicate1D):
-    def __init__(self,threshold, orientation, level,integration = IntegrationType.MEAN):
+    def __init__(self, threshold, orientation, level, integration=IntegrationType.MEAN):
         UnaryPredicate1D.__init__(self)
         self._threshold = threshold
         self._orientation = orientation
         self._level = level
         self._integration = integration
+
     def __call__(self, inter):
         func = GetDirectionalViewMapDensityF1D(self._orientation, self._level, self._integration)
         return (func(inter) < self._threshold)
 
+
 class pyHighSteerableViewMapDensityUP1D(UnaryPredicate1D):
-    def __init__(self,threshold, level,integration = IntegrationType.MEAN):
+    def __init__(self, threshold, level, integration=IntegrationType.MEAN):
         UnaryPredicate1D.__init__(self)
         self._threshold = threshold
         self._level = level
         self._integration = integration
         self._func = GetSteerableViewMapDensityF1D(self._level, self._integration)
+
     def __call__(self, inter):
         return (self._func(inter) > self._threshold)
 
+
 class pyHighDirectionalViewMapDensityUP1D(UnaryPredicate1D):
-    def __init__(self,threshold, orientation, level,integration = IntegrationType.MEAN, sampling=2.0):
+    def __init__(self, threshold, orientation, level, integration=IntegrationType.MEAN, sampling=2.0):
         UnaryPredicate1D.__init__(self)
         self._threshold = threshold
         self._orientation = orientation
         self._level = level
         self._integration = integration
         self._sampling = sampling
+
     def __call__(self, inter):
         func = GetDirectionalViewMapDensityF1D(self._orientation, self._level, self._integration, self._sampling)
         return (func(inter) > self._threshold)
 
+
 class pyHighViewMapDensityUP1D(UnaryPredicate1D):
-    def __init__(self,threshold, level,integration = IntegrationType.MEAN, sampling=2.0):
+    def __init__(self, threshold, level, integration=IntegrationType.MEAN, sampling=2.0):
         UnaryPredicate1D.__init__(self)
         self._threshold = threshold
         self._level = level
         self._integration = integration
         self._sampling = sampling
         self._func = GetCompleteViewMapDensityF1D(self._level, self._integration, self._sampling) # 2.0 is the smpling
+
     def __call__(self, inter):
         return (self._func(inter) > self._threshold)
 
+
 class pyDensityFunctorUP1D(UnaryPredicate1D):
-    def __init__(self,wsize,threshold, functor, funcmin=0.0, funcmax=1.0, integration = IntegrationType.MEAN):
+    def __init__(self, wsize, threshold, functor, funcmin=0.0, funcmax=1.0, integration=IntegrationType.MEAN):
         UnaryPredicate1D.__init__(self)
         self._wsize = wsize
         self._threshold = float(threshold)
@@ -285,6 +323,7 @@ class pyDensityFunctorUP1D(UnaryPredicate1D):
         self._funcmin = float(funcmin)
         self._funcmax = float(funcmax)
         self._integration = integration
+
     def __call__(self, inter):
         func = DensityF1D(self._wsize, self._integration)
         res = self._functor(inter)
@@ -297,14 +336,17 @@ class pyZSmallerUP1D(UnaryPredicate1D):
         UnaryPredicate1D.__init__(self)
         self._z = z
         self._integration = integration
+
     def __call__(self, inter):
         func = GetProjectedZF1D(self._integration)
         return (func(inter) < self._z)
 
+
 class pyIsOccludedByUP1D(UnaryPredicate1D):
     def __init__(self,id):
         UnaryPredicate1D.__init__(self)
         self._id = id
+
     def __call__(self, inter):
         func = GetShapeF1D()
         shapes = func(inter)
@@ -314,7 +356,7 @@ class pyIsOccludedByUP1D(UnaryPredicate1D):
         it = inter.vertices_begin()
         itlast = inter.vertices_end()
         itlast.decrement()
-        v =  it.object
+        v = it.object
         vlast = itlast.object
         tvertex = v.viewvertex
         if type(tvertex) is TVertex:
@@ -338,10 +380,12 @@ class pyIsOccludedByUP1D(UnaryPredicate1D):
                 eit.increment()
         return False
 
+
 class pyIsInOccludersListUP1D(UnaryPredicate1D):
     def __init__(self,id):
         UnaryPredicate1D.__init__(self)
         self._id = id
+
     def __call__(self, inter):
         func = GetOccludersF1D()
         occluders = func(inter)
@@ -350,11 +394,13 @@ class pyIsInOccludersListUP1D(UnaryPredicate1D):
                 return True
         return False
 
+
 class pyIsOccludedByItselfUP1D(UnaryPredicate1D):
     def __init__(self):
         UnaryPredicate1D.__init__(self)
         self.__func1 = GetOccludersF1D()
         self.__func2 = GetShapeF1D()
+
     def __call__(self, inter):
         lst1 = self.__func1(inter)
         lst2 = self.__func2(inter)
@@ -364,11 +410,13 @@ class pyIsOccludedByItselfUP1D(UnaryPredicate1D):
                     return True
         return False
 
+
 class pyIsOccludedByIdListUP1D(UnaryPredicate1D):
     def __init__(self, idlist):
         UnaryPredicate1D.__init__(self)
         self._idlist = idlist
         self.__func1 = GetOccludersF1D()
+
     def __call__(self, inter):
         lst1 = self.__func1(inter)
         for vs1 in lst1:
@@ -377,24 +425,28 @@ class pyIsOccludedByIdListUP1D(UnaryPredicate1D):
                     return True
         return False
 
+
 class pyShapeIdListUP1D(UnaryPredicate1D):
     def __init__(self,idlist):
         UnaryPredicate1D.__init__(self)
         self._idlist = idlist
         self._funcs = []
-        for _id in idlist :
+        for _id in idlist:
             self._funcs.append(ShapeUP1D(_id.first, _id.second))
+
     def __call__(self, inter):
         for func in self._funcs:
             if func(inter) == 1:
                 return True
         return False
 
+
 ## deprecated
 class pyShapeIdUP1D(UnaryPredicate1D):
     def __init__(self, _id):
         UnaryPredicate1D.__init__(self)
         self._id = _id
+
     def __call__(self, inter):
         func = GetShapeF1D()
         shapes = func(inter)
@@ -403,26 +455,31 @@ class pyShapeIdUP1D(UnaryPredicate1D):
                 return True
         return False
 
+
 class pyHighDensityAnisotropyUP1D(UnaryPredicate1D):
     def __init__(self,threshold, level, sampling=2.0):
         UnaryPredicate1D.__init__(self)
         self._l = threshold
         self.func = pyDensityAnisotropyF1D(level, IntegrationType.MEAN, sampling)
+
     def __call__(self, inter):
         return (self.func(inter) > self._l)
 
+
 class pyHighViewMapGradientNormUP1D(UnaryPredicate1D):
     def __init__(self,threshold, l, sampling=2.0):
         UnaryPredicate1D.__init__(self)
         self._threshold = threshold
         self._GetGradient = pyViewMapGradientNormF1D(l, IntegrationType.MEAN)
+
     def __call__(self, inter):
         gn = self._GetGradient(inter)
         #print(gn)
         return (gn > self._threshold)
 
+
 class pyDensityVariableSigmaUP1D(UnaryPredicate1D):
-    def __init__(self,functor, sigmaMin,sigmaMax, lmin, lmax, tmin, tmax, integration = IntegrationType.MEAN, sampling=2.0):
+    def __init__(self, functor, sigmaMin, sigmaMax, lmin, lmax, tmin, tmax, integration=IntegrationType.MEAN, sampling=2.0):
         UnaryPredicate1D.__init__(self)
         self._functor = functor
         self._sigmaMin = float(sigmaMin)
@@ -433,6 +490,7 @@ class pyDensityVariableSigmaUP1D(UnaryPredicate1D):
         self._tmax = tmax
         self._integration = integration
         self._sampling = sampling
+
     def __call__(self, inter):
         sigma = (self._sigmaMax-self._sigmaMin)/(self._lmax-self._lmin)*(self._functor(inter)-self._lmin) + self._sigmaMin
         t = (self._tmax-self._tmin)/(self._lmax-self._lmin)*(self._functor(inter)-self._lmin) + self._tmin
@@ -440,6 +498,7 @@ class pyDensityVariableSigmaUP1D(UnaryPredicate1D):
         self._func = DensityF1D(sigma, self._integration, self._sampling)
         return (self._func(inter) < t)
 
+
 class pyClosedCurveUP1D(UnaryPredicate1D):
     def __call__(self, inter):
         it = inter.vertices_begin()
@@ -456,22 +515,27 @@ class pyClosedCurveUP1D(UnaryPredicate1D):
 ## Binary predicates for 1D elements (curves)
 #############################################
 
+
 class pyZBP1D(BinaryPredicate1D):
     def __call__(self, i1, i2):
         func = GetZF1D()
         return (func(i1) > func(i2))
 
+
 class pyZDiscontinuityBP1D(BinaryPredicate1D):
-    def __init__(self, iType = IntegrationType.MEAN):
+    def __init__(self, iType=IntegrationType.MEAN):
         BinaryPredicate1D.__init__(self)
         self._GetZDiscontinuity = ZDiscontinuityF1D(iType)
+
     def __call__(self, i1, i2):
         return (self._GetZDiscontinuity(i1) > self._GetZDiscontinuity(i2))
 
+
 class pyLengthBP1D(BinaryPredicate1D):
     def __call__(self, i1, i2):
         return (i1.length_2d > i2.length_2d)
 
+
 class pySilhouetteFirstBP1D(BinaryPredicate1D):
     def __call__(self, inter1, inter2):
         bpred = SameShapeIdBP1D()
@@ -481,22 +545,27 @@ class pySilhouetteFirstBP1D(BinaryPredicate1D):
             return (inter2.nature & Nature.SILHOUETTE) != 0
         return (inter1.nature == inter2.nature)
 
+
 class pyNatureBP1D(BinaryPredicate1D):
     def __call__(self, inter1, inter2):
         return (inter1.nature & inter2.nature)
 
+
 class pyViewMapGradientNormBP1D(BinaryPredicate1D):
     def __init__(self,l, sampling=2.0):
         BinaryPredicate1D.__init__(self)
         self._GetGradient = pyViewMapGradientNormF1D(l, IntegrationType.MEAN)
+
     def __call__(self, i1,i2):
         #print("compare gradient")
         return (self._GetGradient(i1) > self._GetGradient(i2))
 
+
 class pyShuffleBP1D(BinaryPredicate1D):
     def __init__(self):
         BinaryPredicate1D.__init__(self)
         random.seed(1)
+
     def __call__(self, inter1, inter2):
         r1 = random.uniform(0,1)
         r2 = random.uniform(0,1)
diff --git a/release/scripts/freestyle/modules/freestyle/shaders.py b/release/scripts/freestyle/modules/freestyle/shaders.py
index f4ff5e75b3d..a6ff61653be 100644
--- a/release/scripts/freestyle/modules/freestyle/shaders.py
+++ b/release/scripts/freestyle/modules/freestyle/shaders.py
@@ -93,6 +93,7 @@ class pyDepthDiscontinuityThicknessShader(StrokeShader):
         self.__min = float(min)
         self.__max = float(max)
         self.__func = ZDiscontinuityF0D()
+
     def shade(self, stroke):
         z_min=0.0
         z_max=1.0
@@ -105,6 +106,7 @@ class pyDepthDiscontinuityThicknessShader(StrokeShader):
             it.object.attribute.thickness = (thickness, thickness)
             it.increment()
 
+
 class pyConstantThicknessShader(StrokeShader):
     """
     Assigns a constant thickness along the stroke
@@ -112,6 +114,7 @@ class pyConstantThicknessShader(StrokeShader):
     def __init__(self, thickness):
         StrokeShader.__init__(self)
         self._thickness = thickness
+
     def shade(self, stroke):
         it = stroke.stroke_vertices_begin()
         while not it.is_end:
@@ -119,6 +122,7 @@ class pyConstantThicknessShader(StrokeShader):
             it.object.attribute.thickness = (t, t)
             it.increment()
 
+
 class pyFXSVaryingThicknessWithDensityShader(StrokeShader):
     """
     Assings thickness to a stroke based on the density of the diffuse map
@@ -130,6 +134,7 @@ class pyFXSVaryingThicknessWithDensityShader(StrokeShader):
         self.threshold_max= threshold_max
         self._thicknessMin = thicknessMin
         self._thicknessMax = thicknessMax
+
     def shade(self, stroke):
         n = stroke.stroke_vertices_size()
         i = 0
@@ -147,6 +152,7 @@ class pyFXSVaryingThicknessWithDensityShader(StrokeShader):
             i = i+1
             it.increment()
 
+
 class pyIncreasingThicknessShader(StrokeShader):
     """
     Increasingly thickens the stroke
@@ -155,6 +161,7 @@ class pyIncreasingThicknessShader(StrokeShader):
         StrokeShader.__init__(self)
         self._thicknessMin = thicknessMin
         self._thicknessMax = thicknessMax
+
     def shade(self, stroke):
         n = stroke.stroke_vertices_size()
         i = 0
@@ -169,6 +176,7 @@ class pyIncreasingThicknessShader(StrokeShader):
             i = i+1
             it.increment()
 
+
 class pyConstrainedIncreasingThicknessShader(StrokeShader):
     """
     Increasingly thickens the stroke, constrained by a ratio of the
@@ -179,6 +187,7 @@ class pyConstrainedIncreasingThicknessShader(StrokeShader):
         self._thicknessMin = thicknessMin
         self._thicknessMax = thicknessMax
         self._ratio = ratio
+
     def shade(self, stroke):
         slength = stroke.length_2d
         tmp = self._ratio*slength
@@ -203,6 +212,7 @@ class pyConstrainedIncreasingThicknessShader(StrokeShader):
             i = i+1
             it.increment()
 
+
 class pyDecreasingThicknessShader(StrokeShader):
     """
     Inverse of pyIncreasingThicknessShader, decreasingly thickens the stroke
@@ -211,6 +221,7 @@ class pyDecreasingThicknessShader(StrokeShader):
         StrokeShader.__init__(self)
         self._thicknessMin = thicknessMin
         self._thicknessMax = thicknessMax
+
     def shade(self, stroke):
         l = stroke.length_2d
         tMax = self._thicknessMax
@@ -229,6 +240,7 @@ class pyDecreasingThicknessShader(StrokeShader):
             i = i+1
             it.increment()
 
+
 class pyNonLinearVaryingThicknessShader(StrokeShader):
     """
     Assigns thickness to a stroke based on an exponential function
@@ -238,6 +250,7 @@ class pyNonLinearVaryingThicknessShader(StrokeShader):
         self._thicknessMin = thicknessMiddle
         self._thicknessMax = thicknessExtremity
         self._exponent = exponent
+
     def shade(self, stroke):
         n = stroke.stroke_vertices_size()
         i = 0
@@ -252,9 +265,11 @@ class pyNonLinearVaryingThicknessShader(StrokeShader):
             it.object.attribute.thickness = (t/2.0, t/2.0)
             i = i+1
             it.increment()
+
     def smoothC(self, a, exp):
         return pow(float(a), exp) * pow(2.0, exp)
 
+
 class pySLERPThicknessShader(StrokeShader):
     """
     Assigns thickness to a stroke based on spherical linear interpolation
@@ -264,6 +279,7 @@ class pySLERPThicknessShader(StrokeShader):
         self._thicknessMin = thicknessMin
         self._thicknessMax = thicknessMax
         self._omega = omega
+
     def shade(self, stroke):
         slength = stroke.length_2d
         tmp = 0.33*slength
@@ -283,6 +299,7 @@ class pySLERPThicknessShader(StrokeShader):
             i = i+1
             it.increment()
 
+
 class pyTVertexThickenerShader(StrokeShader): ## FIXME
     """
     Thickens TVertices (visual intersections between two edges)
@@ -291,6 +308,7 @@ class pyTVertexThickenerShader(StrokeShader): ## FIXME
         StrokeShader.__init__(self)
         self._a = a
         self._n = n
+
     def shade(self, stroke):
         it = stroke.stroke_vertices_begin()
         predTVertex = pyVertexNatureUP0D(Nature.T_VERTEX)
@@ -333,6 +351,7 @@ class pyTVertexThickenerShader(StrokeShader): ## FIXME
                         att.thickness = (r*tr, r*tl)
             it.increment()
 
+
 class pyImportance2DThicknessShader(StrokeShader):
     """
     Assigns thickness based on distance to a given point in 2D space.
@@ -346,6 +365,7 @@ class pyImportance2DThicknessShader(StrokeShader):
         self._w = float(w)
         self._kmin = float(kmin)
         self._kmax = float(kmax)
+
     def shade(self, stroke):
         origin = Vector((self._x, self._y))
         it = stroke.stroke_vertices_begin()
@@ -361,6 +381,7 @@ class pyImportance2DThicknessShader(StrokeShader):
             att.thickness = (k*tr/2.0, k*tl/2.0)
             it.increment()
 
+
 class pyImportance3DThicknessShader(StrokeShader):
     """
     Assigns thickness based on distance to a given point in 3D space
@@ -373,6 +394,7 @@ class pyImportance3DThicknessShader(StrokeShader):
         self._w = float(w)
         self._kmin = float(kmin)
         self._kmax = float(kmax)
+
     def shade(self, stroke):
         origin = Vector((self._x, self._y, self._z))
         it = stroke.stroke_vertices_begin()
@@ -389,6 +411,7 @@ class pyImportance3DThicknessShader(StrokeShader):
             att.thickness = (k*tr/2.0, k*tl/2.0)
             it.increment()
 
+
 class pyZDependingThicknessShader(StrokeShader):
     """
     Assigns thickness based on an object's local Z depth (point
@@ -399,6 +422,7 @@ class pyZDependingThicknessShader(StrokeShader):
         self.__min = min
         self.__max = max
         self.__func = GetProjectedZF0D()
+
     def shade(self, stroke):
         it = stroke.stroke_vertices_begin()
         z_min = 1
@@ -426,12 +450,13 @@ class pyConstantColorShader(StrokeShader):
     """
     Assigns a constant color to the stroke
     """
-    def __init__(self,r,g,b, a = 1):
+    def __init__(self, r, g, b, a=1):
         StrokeShader.__init__(self)
         self._r = r
         self._g = g
         self._b = b
         self._a = a
+
     def shade(self, stroke):
         it = stroke.stroke_vertices_begin()
         while not it.is_end:
@@ -449,19 +474,20 @@ class pyIncreasingColorShader(StrokeShader):
         StrokeShader.__init__(self)
         self._c1 = [r1,g1,b1,a1]
         self._c2 = [r2,g2,b2,a2]
+
     def shade(self, stroke):
         n = stroke.stroke_vertices_size() - 1
         inc = 0
         it = stroke.stroke_vertices_begin()
         while not it.is_end:
             att = it.object.attribute
-            c = float(inc)/float(n)
+            c = float(inc) / float(n)
 
-            att.color = ((1-c)*self._c1[0] + c*self._c2[0],
-                     (1-c)*self._c1[1] + c*self._c2[1],
-                     (1-c)*self._c1[2] + c*self._c2[2])
-            att.alpha = (1-c)*self._c1[3] + c*self._c2[3]
-            inc = inc+1
+            att.color = ((1.0 - c) * self._c1[0] + c * self._c2[0],
+                         (1.0 - c) * self._c1[1] + c * self._c2[1],
+                         (1.0 - c) * self._c1[2] + c * self._c2[2])
+            att.alpha = (1.0 - c) * self._c1[3] + c * self._c2[3]
+            inc = inc + 1
             it.increment()
 
 
@@ -473,21 +499,23 @@ class pyInterpolateColorShader(StrokeShader):
         StrokeShader.__init__(self)
         self._c1 = [r1,g1,b1,a1]
         self._c2 = [r2,g2,b2,a2]
+
     def shade(self, stroke):
         n = stroke.stroke_vertices_size() - 1
         inc = 0
         it = stroke.stroke_vertices_begin()
         while not it.is_end:
             att = it.object.attribute
-            u = float(inc)/float(n)
-            c = 1 - 2 * abs(u - 0.5)
-            att.color = ((1-c)*self._c1[0] + c*self._c2[0],
-                     (1-c)*self._c1[1] + c*self._c2[1],
-                     (1-c)*self._c1[2] + c*self._c2[2])
-            att.alpha = (1-c)*self._c1[3] + c*self._c2[3]
+            u = float(inc) / float(n)
+            c = 1.0 - 2.0 * abs(u - 0.5)
+            att.color = ((1.0 - c) * self._c1[0] + c * self._c2[0],
+                         (1.0 - c) * self._c1[1] + c * self._c2[1],
+                         (1.0 - c) * self._c1[2] + c * self._c2[2])
+            att.alpha = (1.0-c) * self._c1[3] + c * self._c2[3]
             inc = inc+1
             it.increment()
 
+
 class pyMaterialColorShader(StrokeShader):
     """
     Assigns the color of the underlying material to the stroke
@@ -495,6 +523,7 @@ class pyMaterialColorShader(StrokeShader):
     def __init__(self, threshold=50):
         StrokeShader.__init__(self)
         self._threshold = threshold
+
     def shade(self, stroke):
         it = stroke.stroke_vertices_begin()
         func = MaterialF0D()
@@ -536,8 +565,8 @@ class pyMaterialColorShader(StrokeShader):
             v = V / (13. * L) + vn
 
             Y = Yn * pow(((L+16.)/116.), 3.)
-            X = -9. * Y * u / ((u - 4.)* v - u * v)
-            Z = (9. * Y - 15*v*Y - v*X) /( 3. * v)
+            X = -9.0 * Y * u / ((u - 4.0) * v - u * v)
+            Z = (9.0 * Y - 15.0 * v * Y - v * X) / (3.0 * v)
 
             r = 3.240479 * X - 1.53715 * Y - 0.498535 * Z
             g = -0.969256 * X + 1.875991 * Y + 0.041556 * Z
@@ -550,6 +579,7 @@ class pyMaterialColorShader(StrokeShader):
             it.object.attribute.color = (r, g, b)
             it.increment()
 
+
 class pyRandomColorShader(StrokeShader):
     """
     Assigns a color to the stroke based on given seed
@@ -557,6 +587,7 @@ class pyRandomColorShader(StrokeShader):
     def __init__(self, s=1):
         StrokeShader.__init__(self)
         random.seed(s)
+
     def shade(self, stroke):
         ## pick a random color
         c0 = float(random.uniform(15,75))/100.0
@@ -568,6 +599,7 @@ class pyRandomColorShader(StrokeShader):
             it.object.attribute.color = (c0,c1,c2)
             it.increment()
 
+
 class py2DCurvatureColorShader(StrokeShader):
     """
     Assigns a color (greyscale) to the stroke based on the curvature.
@@ -584,6 +616,7 @@ class py2DCurvatureColorShader(StrokeShader):
             it.object.attribute.color = (color, color, color)
             it.increment()
 
+
 class pyTimeColorShader(StrokeShader):
     """
     Assigns a greyscale value that increases for every vertex.
@@ -592,6 +625,7 @@ class pyTimeColorShader(StrokeShader):
     def __init__(self, step=0.01):
         StrokeShader.__init__(self)
         self._step = step
+
     def shade(self, stroke):
         for i, svert in enumerate(iter(stroke)):
             c = i * self._step
@@ -599,6 +633,7 @@ class pyTimeColorShader(StrokeShader):
 
 ## geometry modifiers
 
+
 class pySamplingShader(StrokeShader):
     """
     Resamples the stroke, which gives the stroke the ammount of
@@ -607,10 +642,12 @@ class pySamplingShader(StrokeShader):
     def __init__(self, sampling):
         StrokeShader.__init__(self)
         self._sampling = sampling
+
     def shade(self, stroke):
         stroke.resample(float(self._sampling))
         stroke.update_length()
 
+
 class pyBackboneStretcherShader(StrokeShader):
     """
     Stretches the stroke's backbone by a given length (in pixels)
@@ -618,6 +655,7 @@ class pyBackboneStretcherShader(StrokeShader):
     def __init__(self, l):
         StrokeShader.__init__(self)
         self._l = l
+
     def shade(self, stroke):
         it0 = stroke.stroke_vertices_begin()
         it1 = StrokeVertexIterator(it0)
@@ -642,6 +680,7 @@ class pyBackboneStretcherShader(StrokeShader):
         vn.point = newLast
         stroke.update_length()
 
+
 class pyLengthDependingBackboneStretcherShader(StrokeShader):
     """
     Stretches the stroke's backbone proportional to the stroke's length
@@ -649,6 +688,7 @@ class pyLengthDependingBackboneStretcherShader(StrokeShader):
     def __init__(self, l):
         StrokeShader.__init__(self)
         self._l = l
+
     def shade(self, stroke):
         l = stroke.length_2d
         stretch = self._l*l
@@ -710,6 +750,7 @@ class pyBackboneStretcherNoCuspShader(StrokeShader):
     def __init__(self, l):
         StrokeShader.__init__(self)
         self._l = l
+
     def shade(self, stroke):
         it0 = stroke.stroke_vertices_begin()
         it1 = StrokeVertexIterator(it0)
@@ -732,6 +773,7 @@ class pyBackboneStretcherNoCuspShader(StrokeShader):
             vn.point = newLast
         stroke.update_length()
 
+
 class pyDiffusion2Shader(StrokeShader):
     """
     Iteratively adds an offset to the position of each stroke vertex
@@ -745,6 +787,7 @@ class pyDiffusion2Shader(StrokeShader):
         self._nbIter = nbIter
         self._normalInfo = Normal2DF0D()
         self._curvatureInfo = Curvature2DAngleF0D()
+
     def shade(self, stroke):
         for i in range (1, self._nbIter):
             it = stroke.stroke_vertices_begin()
@@ -756,6 +799,7 @@ class pyDiffusion2Shader(StrokeShader):
                 it.increment()
         stroke.update_length()
 
+
 class pyTipRemoverShader(StrokeShader):
     """
     Removes the tips of the stroke
@@ -763,6 +807,7 @@ class pyTipRemoverShader(StrokeShader):
     def __init__(self, l):
         StrokeShader.__init__(self)
         self._l = l
+
     def shade(self, stroke):
         originalSize = stroke.stroke_vertices_size()
         if originalSize < 4:
@@ -792,6 +837,7 @@ class pyTipRemoverShader(StrokeShader):
             it.increment()
         stroke.update_length()
 
+
 class pyTVertexRemoverShader(StrokeShader):
     """
     Removes t-vertices from the stroke
@@ -809,6 +855,7 @@ class pyTVertexRemoverShader(StrokeShader):
             stroke.remove_vertex(itlast.object)
         stroke.update_length()
 
+
 #class pyExtremitiesOrientationShader(StrokeShader):
 #    def __init__(self, x1,y1,x2=0,y2=0):
 #        StrokeShader.__init__(self)
@@ -819,6 +866,7 @@ class pyTVertexRemoverShader(StrokeShader):
 #        stroke.setBeginningOrientation(self._v1.x,self._v1.y)
 #        stroke.setEndingOrientation(self._v2.x,self._v2.y)
 
+
 class pyHLRShader(StrokeShader):
     """
     Controlls visibility based upon the quantative invisibility (QI)
@@ -850,9 +898,11 @@ class pyHLRShader(StrokeShader):
                 v.attribute.visible = False
             it.increment()
             it2.increment()
+
     def get_fedge(self, it1, it2):
         return it1.get_fedge(it2)
 
+
 # broken and a mess
 class pyTVertexOrientationShader(StrokeShader):
     def __init__(self):
@@ -860,6 +910,7 @@ class pyTVertexOrientationShader(StrokeShader):
         self._Get2dDirection = Orientation2DF1D()
     ## finds the TVertex orientation from the TVertex and
     ## the previous or next edge
+
     def findOrientation(self, tv, ve):
         mateVE = tv.get_mate(ve)
         if ve.qi != 0 or mateVE.qi != 0:
@@ -881,12 +932,14 @@ class pyTVertexOrientationShader(StrokeShader):
                     direction = self._Get2dDirection(winner.first_fedge)
                 return direction
         return None
+
     def castToTVertex(self, cp):
         if cp.t2d() == 0.0:
             return cp.first_svertex.viewvertex
         elif cp.t2d() == 1.0:
             return cp.second_svertex.viewvertex
         return None
+
     def shade(self, stroke):
         it = stroke.stroke_vertices_begin()
         it2 = StrokeVertexIterator(it)
@@ -926,9 +979,11 @@ class pyTVertexOrientationShader(StrokeShader):
                 if dir is not None:
                     #print(dir.x, dir.y)
                     v.attribute.set_attribute_vec2("orientation", dir)
+
     def get_fedge(self, it1, it2):
         return it1.get_fedge(it2)
 
+
 class pySinusDisplacementShader(StrokeShader):
     """
     Displaces the stroke in the shape of a sine wave
@@ -938,6 +993,7 @@ class pySinusDisplacementShader(StrokeShader):
         self._f = f
         self._a = a
         self._getNormal = Normal2DF0D()
+
     def shade(self, stroke):
         it = stroke.stroke_vertices_begin()
         while not it.is_end:
@@ -954,18 +1010,20 @@ class pySinusDisplacementShader(StrokeShader):
             it.increment()
         stroke.update_length()
 
+
 class pyPerlinNoise1DShader(StrokeShader):
     """
     Displaces the stroke using the curvilinear abscissa.  This means
     that lines with the same length and sampling interval will be
     identically distorded
     """
-    def __init__(self, freq = 10, amp = 10, oct = 4, seed = -1):
+    def __init__(self, freq=10, amp=10, oct=4, seed=-1):
         StrokeShader.__init__(self)
         self.__noise = Noise(seed)
         self.__freq = freq
         self.__amp = amp
         self.__oct = oct
+
     def shade(self, stroke):
         it = stroke.stroke_vertices_begin()
         while not it.is_end:
@@ -976,6 +1034,7 @@ class pyPerlinNoise1DShader(StrokeShader):
             it.increment()
         stroke.update_length()
 
+
 class pyPerlinNoise2DShader(StrokeShader):
     """
     Displaces the stroke using the strokes coordinates.  This means
@@ -984,12 +1043,13 @@ class pyPerlinNoise2DShader(StrokeShader):
     More information on the noise shaders can be found at
     freestyleintegration.wordpress.com/2011/09/25/development-updates-on-september-25/
     """
-    def __init__(self, freq = 10, amp = 10, oct = 4, seed = -1):
+    def __init__(self, freq=10, amp=10, oct=4, seed=-1):
         StrokeShader.__init__(self)
         self.__noise = Noise(seed)
         self.__freq = freq
         self.__amp = amp
         self.__oct = oct
+
     def shade(self, stroke):
         it = stroke.stroke_vertices_begin()
         while not it.is_end:
@@ -999,15 +1059,17 @@ class pyPerlinNoise2DShader(StrokeShader):
             it.increment()
         stroke.update_length()
 
+
 class pyBluePrintCirclesShader(StrokeShader):
     """
     Draws the silhouette of the object as a circle
     """
-    def __init__(self, turns = 1, random_radius = 3, random_center = 5):
+    def __init__(self, turns=1, random_radius=3, random_center=5):
         StrokeShader.__init__(self)
         self.__turns = turns
         self.__random_center = random_center
         self.__random_radius = random_radius
+
     def shade(self, stroke):
         it = stroke.stroke_vertices_begin()
         if it.is_end:
@@ -1035,7 +1097,7 @@ class pyBluePrintCirclesShader(StrokeShader):
         sv_nb = sv_nb // self.__turns
         center = (p_min + p_max) / 2
         radius = (center.x - p_min.x + center.y - p_min.y) / 2
-        p_new = Vector((0,0))
+        p_new = Vector((0.0, 0.0))
 #######################################################
         R = self.__random_radius
         C = self.__random_center
@@ -1064,15 +1126,17 @@ class pyBluePrintCirclesShader(StrokeShader):
             stroke.remove_vertex(sv)
         stroke.update_length()
 
+
 class pyBluePrintEllipsesShader(StrokeShader):
     """
     Draws the silhouette of the object as an ellips
     """
-    def __init__(self, turns = 1, random_radius = 3, random_center = 5):
+    def __init__(self, turns=1, random_radius=3, random_center=5):
         StrokeShader.__init__(self)
         self.__turns = turns
         self.__random_center = random_center
         self.__random_radius = random_radius
+
     def shade(self, stroke):
         it = stroke.stroke_vertices_begin()
         if it.is_end:
@@ -1095,7 +1159,7 @@ class pyBluePrintEllipsesShader(StrokeShader):
         sv_nb = sv_nb // self.__turns
         center = (p_min + p_max) / 2
         radius = center - p_min
-        p_new = Vector((0,0))
+        p_new = Vector((0.0, 0.0))
 #######################################################
         R = self.__random_radius
         C = self.__random_center
@@ -1129,11 +1193,12 @@ class pyBluePrintSquaresShader(StrokeShader):
     """
     Draws the silhouette of the object as a square
     """
-    def __init__(self, turns = 1, bb_len = 10, bb_rand = 0):
+    def __init__(self, turns=1, bb_len=10, bb_rand=0):
         StrokeShader.__init__(self)
         self.__turns = turns
         self.__bb_len = bb_len
         self.__bb_rand = bb_rand
+
     def shade(self, stroke):
         it = stroke.stroke_vertices_begin()
         if it.is_end:
@@ -1203,7 +1268,7 @@ class pyBluePrintSquaresShader(StrokeShader):
                     p_new = p_fourth + vec_fourth * float(i - third)/float(fourth - third - 1)
                     if i == fourth - 1:
                         visible = False
-                if it.object == None:
+                if it.object is None:
                     i = i + 1
                     it.increment()
                     if not visible:
@@ -1223,16 +1288,18 @@ class pyBluePrintSquaresShader(StrokeShader):
             stroke.remove_vertex(sv)
         stroke.update_length()
 
+
 # needs a docstring
 class pyBluePrintDirectedSquaresShader(StrokeShader):
-    def __init__(self, turns = 1, bb_len = 10, mult = 1):
+    def __init__(self, turns=1, bb_len=10, mult=1):
         StrokeShader.__init__(self)
         self.__mult = mult
         self.__turns = turns
         self.__bb_len = 1 + float(bb_len) / 100
+
     def shade(self, stroke):
         stroke.resample(32 * self.__turns)
-        p_mean = Vector((0, 0))
+        p_mean = Vector((0.0, 0.0))
         it = stroke.stroke_vertices_begin()
         while not it.is_end:
             p = it.object.point
@@ -1264,7 +1331,7 @@ class pyBluePrintDirectedSquaresShader(StrokeShader):
 ##      print(theta)
         if p_var_yy > p_var_xx:
             e1 = Vector((cos(theta + pi / 2), sin(theta + pi / 2))) * sqrt(lambda1) * self.__mult
-            e2 = Vector((cos(theta + pi), sin(theta + pi))) *  sqrt(lambda2) * self.__mult
+            e2 = Vector((cos(theta + pi), sin(theta + pi))) * sqrt(lambda2) * self.__mult
         else:
             e1 = Vector((cos(theta), sin(theta))) * sqrt(lambda1) * self.__mult
             e2 = Vector((cos(theta + pi / 2), sin(theta + pi / 2))) * sqrt(lambda2) * self.__mult
@@ -1320,14 +1387,16 @@ class pyBluePrintDirectedSquaresShader(StrokeShader):
             stroke.remove_vertex(sv)
         stroke.update_length()
 
+
 class pyModulateAlphaShader(StrokeShader):
     """
     Limits the stroke's alpha between a min and max value
     """
-    def __init__(self, min = 0, max = 1):
+    def __init__(self, min=0, max=1):
         StrokeShader.__init__(self)
         self.__min = min
         self.__max = max
+
     def shade(self, stroke):
         it = stroke.stroke_vertices_begin()
         while not it.is_end:
@@ -1341,6 +1410,7 @@ class pyModulateAlphaShader(StrokeShader):
             it.object.attribute.alpha = alpha
             it.increment()
 
+
 ## various
 class pyDummyShader(StrokeShader):
     def shade(self, stroke):
@@ -1352,6 +1422,7 @@ class pyDummyShader(StrokeShader):
             att.thickness = (0, 5)
             it.increment()
 
+
 class pyDebugShader(StrokeShader):
     def shade(self, stroke):
         fe = CF.get_selected_fedge()
diff --git a/release/scripts/freestyle/modules/parameter_editor.py b/release/scripts/freestyle/modules/parameter_editor.py
index 80a8740145f..f3dd66b78cc 100644
--- a/release/scripts/freestyle/modules/parameter_editor.py
+++ b/release/scripts/freestyle/modules/parameter_editor.py
@@ -1133,9 +1133,11 @@ def iter_three_segments(stroke):
             it3.increment()
             it4.increment()
 
+
 def is_tvertex(svertex):
     return type(svertex.viewvertex) is TVertex
 
+
 class StrokeCleaner(StrokeShader):
     def shade(self, stroke):
         for sv1, sv2, sv3, sv4 in iter_three_segments(stroke):
diff --git a/release/scripts/freestyle/styles/apriori_density.py b/release/scripts/freestyle/styles/apriori_density.py
index 22f924d8e98..b52bcfbeb4e 100644
--- a/release/scripts/freestyle/styles/apriori_density.py
+++ b/release/scripts/freestyle/styles/apriori_density.py
@@ -42,7 +42,7 @@ bpred = TrueBP1D()
 upred = AndUP1D(QuantitativeInvisibilityUP1D(0), pyHighViewMapDensityUP1D(0.0007,5))
 Operators.bidirectional_chain(ChainPredicateIterator(upred, bpred), NotUP1D(QuantitativeInvisibilityUP1D(0)))
 shaders_list = 	[
-		ConstantThicknessShader(2), 
-		ConstantColorShader(0.0, 0.0, 0.0,1)
-		]
+    ConstantThicknessShader(2),
+    ConstantColorShader(0.0, 0.0, 0.0, 1.0)
+    ]
 Operators.create(TrueUP1D(), shaders_list)
diff --git a/release/scripts/freestyle/styles/long_anisotropically_dense.py b/release/scripts/freestyle/styles/long_anisotropically_dense.py
index 890696d7779..50bec4f1a79 100644
--- a/release/scripts/freestyle/styles/long_anisotropically_dense.py
+++ b/release/scripts/freestyle/styles/long_anisotropically_dense.py
@@ -55,6 +55,7 @@ class pyDensityUP1D(UnaryPredicate1D):
         self._integration = integration
         self._func = DensityF1D(self._wsize, self._integration, sampling)
         self._func2 = DensityF1D(self._wsize, IntegrationType.MAX, sampling)
+
     def __call__(self, inter):
         c = self._func(inter)
         m = self._func2(inter)
diff --git a/release/scripts/freestyle/styles/multiple_parameterization.py b/release/scripts/freestyle/styles/multiple_parameterization.py
index 482d8bd94f7..bf0691f2ce1 100644
--- a/release/scripts/freestyle/styles/multiple_parameterization.py
+++ b/release/scripts/freestyle/styles/multiple_parameterization.py
@@ -53,6 +53,6 @@ shaders_list = [
     ConstantColorShader(0.0, 0.0, 0.0),
     IncreasingColorShader(1, 0, 0, 1, 0, 1, 0, 1),
     TextureAssignerShader(-1),
-    pyHLRShader(), ## this shader draws only visible portions
+    pyHLRShader(),  ## this shader draws only visible portions
     ]
 Operators.create(TrueUP1D(), shaders_list)