diff --git a/src/diana/drawer/base.py b/src/diana/drawer/base.py
--- a/src/diana/drawer/base.py
+++ b/src/diana/drawer/base.py
@@ -1,57 +1,57 @@
 import os
 from itertools import count
 
-from jinja2 import Environment,FileSystemLoader
+from jinja2 import Environment, FileSystemLoader
 
 
 class DiagramPoint:
-	def __init__(self,x,y,color="",label=""):
-		self.x=x
-		self.y=y
-		self.color=color
-		self.label=label
+	def __init__(self, x, y, color="", label=""):
+		self.x = x
+		self.y = y
+		self.color = color
+		self.label = label
 
 	def __repr__(self):
-		return 'DiagramPoint({0},{1},"{2}","{3}")'.format(self.x,self.y,self.color,self.label)
+		return 'DiagramPoint({0},{1},"{2}","{3}")'.format(self.x, self.y, self.color, self.label)
 
 
 class Base:
-	highNumbers=True
+	highNumbers = True
 
-	def __init__(self,start=0):
-		self.overlays=[]
-		self._letter="a"
+	def __init__(self, start=0):
+		self.overlays = []
+		self._letter = "a"
 
-		self._index=dict()
-		self._indexGen=count(start)
+		self._index = dict()
+		self._indexGen = count(start)
 
-		curDir=os.path.dirname(__file__)
-		templateDir=os.path.join(curDir,"..","templ")
-		self._env=Environment(loader=FileSystemLoader(templateDir))
-		self._env.trim_blocks=True
-		self._env.lstrip_blocks=True
+		curDir = os.path.dirname(__file__)
+		templateDir = os.path.join(curDir, "..", "templ")
+		self._env = Environment(loader=FileSystemLoader(templateDir))
+		self._env.trim_blocks = True
+		self._env.lstrip_blocks = True
 
-	def addStone(self,x,y,color):
-		assert (x,y) not in self._index
-		self._index[(x,y)]=(next(self._indexGen),DiagramPoint(x,y,color))
+	def addStone(self, x, y, color):
+		assert (x, y) not in self._index
+		self._index[(x, y)] = (next(self._indexGen), DiagramPoint(x, y, color))
 
-	def addMove(self,x,y,color,label):
-		if (not self.highNumbers) and isinstance(label,int) and label%100!=0:
-			label%=100
+	def addMove(self, x, y, color, label):
+		if (not self.highNumbers) and isinstance(label, int) and label%100 != 0:
+			label %= 100
 
-		if (x,y) not in self._index:
-			self._index[(x,y)]=(next(self._indexGen),DiagramPoint(x,y,color,label))
+		if (x, y) not in self._index:
+			self._index[(x, y)] = (next(self._indexGen), DiagramPoint(x, y, color, label))
 		else:
-			(_,point)=self._index[(x,y)]
+			(_, point) = self._index[(x, y)]
 			if not point.label:
-				point.label=self._letter
-				self._letter=chr(ord(self._letter)+1)
+				point.label = self._letter
+				self._letter = chr(ord(self._letter)+1)
 			self.overlays.append((label, point.label))
 
-	def addLabel(self,x,y,label):
-		self._index[(x,y)]=(next(self._indexGen),DiagramPoint(x,y,"",label))
+	def addLabel(self, x, y, label):
+		self._index[(x, y)] = (next(self._indexGen), DiagramPoint(x, y, "", label))
 
-	def save(self,filename):
+	def save(self, filename):
 		notes=open(filename+".txt", 'w')
-		notes.write("\n".join("{0} = {1}".format(a,b) for (a,b) in self.overlays))
+		notes.write("\n".join("{0} = {1}".format(a, b) for (a, b) in self.overlays))
 		notes.close()