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a script to precisely draw on the screen with the turtle module

from turtle import *
from ion import *
from time import *
from kandinsky import draw_string as ds, fill_rect as fr
from math import fabs

def pp(s,rs="",rx=310):
  fr(0,202,320,20,(192,)*3)
  ds(s,0,202,(0,)*3,(192,)*3)
  ds(rs,rx,202,(0,)*3,(192,)*3)

def rr(s=""):
  do=True
  t=""
  m=""
  pp(s)
  cdt=True
  while do:
    if keydown(KEY_ZERO):
      t+="0"
    elif keydown(KEY_ONE):
      t+="1"
    elif keydown(KEY_TWO):
      t+="2"
    elif keydown(KEY_THREE):
      t+="3"
    elif keydown(KEY_FOUR):
      t+="4"
    elif keydown(KEY_FIVE):
      t+="5"
    elif keydown(KEY_SIX):
      t+="6"
    elif keydown(KEY_SEVEN):
      t+="7"
    elif keydown(KEY_EIGHT):
      t+="8"
    elif keydown(KEY_NINE):
      t+="9"
    elif keydown(KEY_OK):
      do=False
    elif keydown(KEY_MINUS):
      if m=="-":
        m=""
      else:
        m="-"
    elif keydown(KEY_BACKSPACE):
      t=""
    else:
      cdt=False
    
    if cdt:
      sleep(0.17)
      pp(s+m+t,rs="escape: 200",rx=210)
    else:
      sleep(0.02)
      cdt=True

  try:
    return int(m+t)
  except:
    return 0

go=True
s=0.1
pen="z"
l="z"
co=[10,15]

penup()
goto(0,0)

while go:
  if keydown(KEY_UP):
    goto(position()[0],position()[1]+co[0])
  elif keydown(KEY_DOWN):
    goto(position()[0],position()[1]-co[0])
  elif keydown(KEY_LEFT):
    goto(position()[0]-co[0],position()[1])
  elif keydown(KEY_RIGHT):
    goto(position()[0]+co[0],position()[1])
  elif keydown(KEY_COMMA):
    left(co[1])
  elif keydown(KEY_POWER):
    right(co[1])
  elif keydown(KEY_XNT):
    forward(co[0])
  elif keydown(KEY_LOG):
    backward(co[0])
  elif keydown(KEY_OK):
    if isdown():
      penup()
      pen="U"
    else:
      pendown()
      pen="D"
    sleep(0.2)
  elif keydown(17):
   if rr("1=clear? ")==1:
    reset()
    s=0.1
    pen="z"
    l="z"
    co=[10,15]
  elif keydown(KEY_SHIFT):
    if s>0.001:
      s/=2
    sleep(0.2)
  elif keydown(KEY_ALPHA):
    s*=2
    sleep(0.2)
  elif keydown(16):
    xy=rr("x: "),rr("y: ")
    if fabs(xy[0])<200 and fabs(xy[1])<200:
      goto(xy[0],xy[1])
  elif keydown(KEY_VAR):
    setheading(rr("deg: "))
  elif keydown(KEY_LN):
    co[0]=rr("pix: ")
  elif keydown(21):
    co[1]=rr("deg: ")
  elif keydown(KEY_EXP):
    if l=="W":
      color('black')
      l="K"
    else:
      color('white')
      l="W"
  
  a=pen+l+str(round(s,3))
  b="; xy"+str(round(position()[0])) +":"+ str(round(position()[1]))
  c="; h"+str(round(heading()))
  d="; p"+str(co[0]) + " d"+str(co[1])
  pp(a+b+c+d)
  sleep(s)