old_contents: import turtle
  import math
  import sys
  
  class Paley:
  
      def __init__(self, p, radius = 290):
          self.p = p
          self.radius = radius
  
      """Return coordinates of ith vertex"""
      def getVertex(self, i):
          angle = i * 2 * math.pi / self.p
          return (self.radius * math.cos(angle), self.radius * math.sin(angle))
  
      """Draw the Paley graph"""
      def draw(self):
          t = turtle.Turtle()
          t.speed(0)
          t.ht()
          visited = [[False for j in xrange(self.p)] for i in xrange(self.p)]
          for i in xrange(self.p):
              t.pu()
              t.goto(self.getVertex(i))
              for residue in xrange(1, (self.p - 1) / 2):
                  j = (i + residue * residue) % self.p
                  if not visited[i][j]:
                      t.pd()
                      t.goto(self.getVertex(j))
                      t.pu()
                      t.goto(self.getVertex(i))
                      visited[i][j] = visited[j][i] = True
          turtle.done()
  
  def main(): 
      if len(sys.argv) > 1:
          pal = Paley(int(sys.argv[1]))
          if len(sys.argv) > 2:
              pal.radius = int(sys.argv[2])
          pal.draw()
      else:
          print "Please specify size of Paley graph"
  
  if __name__ == "__main__":
      main()
  
new_contents: import turtle
  import math
  import sys
  
  class Paley:
  
      def __init__(self, p, radius = 290, speed = 0):
          self.p = p
          self.radius = radius
          self.speed = speed
  
      """Return coordinates of ith vertex"""
      def getVertex(self, i):
          angle = i * 2 * math.pi / self.p
          return (self.radius * math.cos(angle), self.radius * math.sin(angle))
  
      """Draw the Paley graph"""
      def draw(self):
          t = turtle.Turtle()
          t.speed(self.speed)
          t.ht()
          visited = [[False for j in xrange(self.p)] for i in xrange(self.p)]
          for i in xrange(self.p):
              t.pu()
              t.goto(self.getVertex(i))
              for residue in xrange(1, (self.p - 1) / 2):
                  j = (i + residue * residue) % self.p
                  if not visited[i][j]:
                      t.pd()
                      t.goto(self.getVertex(j))
                      t.pu()
                      t.goto(self.getVertex(i))
                      visited[i][j] = visited[j][i] = True
          turtle.done()
  
  def main(): 
      if len(sys.argv) > 1:
          pal = Paley(int(sys.argv[1]))
          if len(sys.argv) > 2:
              pal.radius = int(sys.argv[2])
          pal.draw()
      else:
          print "Please specify size of Paley graph"
  
  if __name__ == "__main__":
      main()
  
subject: Add speed parameter