1.画圣诞树importturtle
screen=turtle.Screen()
screen.setup(800,600)
circle=turtle.Turtle()
circle.shape('circle')
circle.color('red')
circle.speed('fastest')
circle.up()
square=turtle.Turtle()
square.shape('square')
square.color('green')
square.speed('fastest')
square.up()
circle.goto(0,280)
circle.stamp()
k=0
foriinrange(1,17):
y=30*i
forjinrange(i-k):
x=30*j
square.goto(x,-y+280)
square.stamp()
square.goto(-x,-y+280)
square