from turtle import *
import random
def square(colour):
if colour==1:
fillcolor("black")
else:
fillcolor("white")
begin_fill()
for i in range(4):
forward(10)
left(90)
end_fill()
def move(x,y):
penup()
goto(10*x,-10*y)
pendown()
n=input("请输入n")
n=int(n)
first_colour=random.randint(0,1)
for y in range(n):
for x in range(n):
move(x,y)
Sum=x+y
if (Sum%2)!=0:
colour=(first_colour+1)%2
else:
colour=first_colour
square(colour)
hideturtle()
#down()
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