my_tree.py
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import turtle
import random
list1=["snow","lightcoral"]
def tree(n):
if n >=10:
if n<=20:
pen.pencolor(random.choice(list1))
pen.pensize(n/3)
else:
pen.pencolor("sienna")
pen.pensize(n/10)
jiaodu = random.randint(5,30)
changdu = random.randint(5,15)
pen.forward(n)
pen.right(jiaodu)
tree(n-changdu)
pen.left(jiaodu*2)
tree(n-changdu)
pen.right(jiaodu)
pen.up()
pen.backward(n)
pen.down()
pen = turtle.Turtle()
pen.color('sienna')
pen.pensize(3)
# 画布大小
w = turtle.Screen()
w.bgcolor('wheat') # wheat小麦
# 移动到起点
pen.left(90)
pen.up()
pen.backward(150) # 后退
pen.down()
tree(90)
turtle.done()