python图形工具turtle绘制国际象棋棋盘

#编写程序绘制一个国际象棋的棋盘
import turtle
turtle.speed(30)
turtle.penup()
off = True
for y in range(-40, 30 + 1, 10):
 for x in range(-40, 30 + 1, 10):
 if off:
 turtle.goto(x, y)
 turtle.pendown()
 turtle.begin_fill()
 turtle.color("black")
 turtle.forward(10)
 turtle.left(90)
 turtle.forward(10)
 turtle.left(90)
 turtle.forward(10)
 turtle.left(90)
 turtle.forward(10)
 turtle.left(90)
 turtle.end_fill()
 turtle.penup()
 else:
 turtle.goto(x, y)
 turtle.pendown()
 turtle.forward(10)
 turtle.left(90)
 turtle.forward(10)
 turtle.left(90)
 turtle.forward(10)
 turtle.left(90)
 turtle.forward(10)
 turtle.left(90)
 turtle.penup()
 off = bool(int(off) - 1)
 off = bool(int(off) - 1)
turtle.hideturtle()
turtle.done()

import turtle
#Draw a square
def drawSquare():
 turtle.pendown()
 turtle.forward(10)
 turtle.left(90)
 turtle.forward(10)
 turtle.left(90)
 turtle.forward(10)
 turtle.left(90)
 turtle.forward(10)
 turtle.left(90)
 turtle.penup()

#编写程序绘制一个国际象棋的棋盘
 
import turtle
from UsefulTurtleFunctions import *
turtle.speed(30)
turtle.penup()
off = True
for y in range(-40, 30 + 1, 10):
 for x in range(-40, 30 + 1, 10):
 if off:
 turtle.goto(x, y)
 turtle.begin_fill()
 turtle.color("black")
 drawSquare()
 turtle.end_fill()
 turtle.penup()
 else:
 turtle.goto(x, y)
 drawSquare()
 off = bool(int(off) - 1)
 off = bool(int(off) - 1)
turtle.hideturtle()
turtle.done()