Tree using python turtle

from turtle import *

speed('fastest')

# turning the turtle to face upwards

rt(-90)

# the base and branch of the Y

angle = 30

# function to plot a Y

def y(sz, level):

    if level > 0:

        colormode(255)

        pencolor(0, 255//level, 0)

        fd(sz)

        rt(angle)

        # recursive call 

        y(0.8 * sz, level-1)

        pencolor(0, 255//level, 0)

        lt( 2 * angle )

        y(0.8 * sz, level-1)

        pencolor(0, 255//level, 0)

        rt(angle)

        fd(-sz)

y(80, 7)