my_tree.py
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import turtle
import random
def tree(n):
if n>=0:
if n<=12:
pen.color("lightcoral")
pen.pensize(n/3)
else:
pen.color("sienna")
pen.pensize(n/10)
pen.forward(n)
a=random.randint(0,30)
b=random.randint(0,15)
pen.right(a)
tree(n-b)
pen.left(a*2)
tree(n-b)
pen.right(a)
pen.penup()
pen.forward(-n)
pen.pendown()
pen.down()
pen = turtle.Turtle()
pen.speed(0)
pen.color('sienna')
# 画布大小
w = turtle.Screen()
w.bgcolor('wheat') # wheat小麦
# 移动到起点
pen.left(90)
pen.penup()
pen.forward(-150) # 后退
pen.pendown()
tree(60)
# pen.forward(100)
# pen.right(30)
# pen.forward(50)
# pen.penup()
# pen.forward(-50)
# pen.pendown()
# pen.left(60)
# pen.forward(50)
# pen.forward(-50)
# pen.right(30)
# pen.forward(-100)
turtle.done()