Нарисовать зигзаг

from tkinter import Label, Button, Entry, Tk, Canvas, END
def draw():
  count = 0
  try:
    count = int(entry.get())
  except:
    return 
  if count<2:
    return
  label.destroy()
  entry.destroy()
  button.destroy()
  canvas = Canvas(root)
  canvas.pack()
  w = int(canvas["width"])
  h = int(canvas["height"])
  k = h / 4
  x = 0
  y = h / 2 - k
  points = []
  points.append(x)
  points.append(y)
  for i in range(count):
    x = x + w / count
    if i%2 == 0:
      y = h / 2 + k
    else:
      y = h / 2 - k
    points.append(x)
    points.append(y)
  canvas.create_line(points, fill='blue', width=4)
 
root = Tk()
label = Label(root, text='введите количество отрезков')
label.pack()
entry = Entry(root)
entry.focus_set()
entry.insert(END, '10')
entry.pack()
button = Button(root, text='OK', command=draw)
button.pack()
root.mainloop()