One_More

 More code to play with on the fractal tree problem. It does one run in black, then changes to magenta, 

then cyan, and goes backward in green!!

 https://youtu.be/qnx_NCgVZ14                                                              

from turtle import*
goto(0, -100)
pensize(2)
speed(1)
left(90)

def branch(branch_len):
    if branch_len>10:
       color('black')
       angle=30
       forward(branch_len)
       left(angle)
       color('magenta')
       branch(branch_len*0.7)
       right(angle*2)
       color('cyan')
       branch(branch_len * 0.7)
       left(angle)
       color('green')
       backward(branch_len)

branch(100)