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• Calculator

import time
from kandinsky import *
from turtle import *
from ion import *

def sfire(x,y):
  px=x+170
  py=111-y
  for i in range(px,300,1):
    time.sleep(0.0005)
    set_pixel(i,py,'red')
  for i in range(px,300,1):
    time.sleep(0.0005)
    set_pixel(i,py,'white')

def keydown02():
  reset()
  penup()
  tf=True
  x,y=-150,0
  goto(x,y)
  while tf:
#    draw_string(str(tf),100,90)
#    draw_string(str(x),100,120)
#    draw_string(str(y),100,150)
    goto(x,y)
    if keydown(KEY_LEFT):
      x-=1
      if x<-150:
        x=-150
    elif keydown(KEY_RIGHT):
      x+=1
      if x>150:
        x=150
    elif keydown(KEY_UP):
      y+=1
      if y>100:
        y=100
    elif keydown(KEY_DOWN):
      y-=1
      if y<-100:
        y=-100
    elif keydown(KEY_BACKSPACE):
      sfire(x,y)
    elif keydown(KEY_OK):
      tf=False
    else:
      tf=True
    time.sleep(0.005)