Python画飘零的樱花树 随机

from turtle import *
from random import *
from math import *
def tree(n,l):
pd()
t=cos(radians(heading()+45))/8+0.25
pencolor(t, t, t)
pensize(n/3)
forward(l)
if n>0:
b=random()15+10
c=random()15+10
d=1(random()0.25+0.7)
right(b)
tree(n-1, d)
left(b + c)
tree(n-1,d)
right(c)
else:
right(90)
n=cos(radians(heading()-45))/4+0.5
pencolor(n,n0.8,n0.8)
circle(3)
left(90)
if (random()>0.7):
pu()
t=heading()
an=-40+random()40
setheading(an)
dis=int(800random()0.5+400random()0.3+200random()0.2)
forward(dis)
setheading(t)
pd()
right(90)
n=cos(radians(heading()-45))/4+0.5
pencolor(n0.5+0.5,0.4+n0.4,0.4+n0.4)
circle(2)
left(90)
pu()
t=heading()
setheading(an)
backward(dis)
setheading(t)
pu()
backward(l)
bgcolor(0.5,0.5,0.5)
ht()
speed(0)
tracer(0, 0)
pu()
backward(100)
left(90)
pu()
backward(300)
tree(10,100)
done()
turtle.exitonclick()