import turtle
import random


def tree(branchLen,t):
    if branchLen > 5:
        if branchLen <= 20:
             t.color("green")
        else:
             t.color("brown")
        y = t.heading()

        th = random.randrange(20,40)
        tr = random.randrange(10,15)
        ts = random.randrange(50,80)

        t.pensize(branchLen * 0.05)
        t.forward(branchLen)
        t.right(th)
        tree(branchLen-tr,t)
        t.left(ts)
        tree(branchLen-tr,t)
        t.setheading(y)
        t.backward(branchLen)
        t.color("brown")




def main():
    t = turtle.Turtle()
    myWin = turtle.Screen()
    t.left(90)
    t.up()
    t.backward(90)
    t.down()
    t.color("brown")
    tree(75,t)
    myWin.exitonclick()

main()