Manejando turtle , funciones y circulos

from turtle import *
color('black', 'cyan')

speed(10000)

penup()

pendown()

def dibujar():
    a = 0    begin_fill()
    while True:
      penup()
      forward(100)
      left(170)
      pendown()
      circle(30)
      a=a+10      if a==360:
         break    end_fill()

a=-500b=400pendown()
for f in range (0,6):
    b=b-100    a=-500    for x in range (0,14):
      penup()

      goto(a,b)
      pendown()
      dibujar()
      a=a+100


done()