Tree

from graphics import *
import math
from random import randint

winS = 700

win = GraphWin("Tree", winS, winS)

def sin(a):
    return math.sin(math.radians(a))
def cos(a):
    return math.cos(math.radians(a))

def tree(i,a,b=60,r=270,x=winS//2,y=winS-30):

    if a <= 0 or b < 2:
        return

    xx = round(cos(r) * b)
    yy = round(sin(r) * b)

    s = Line(Point(x, y), Point( x + xx, y + yy))
    s.draw(win)
    s.setWidth(a//1.5)

    i = randint(-30,30)
    tree(i, a-1, b , r + i, x + xx, y + yy)

    if i%2==0:
        tree(i, a-1, b , r - i, x + xx, y + yy)

tree(10,20,16,270)

while True:
    update(1)