"""File:     draw_triangle.py
   Purpose:  Use the TurtleWorld module in Swampy to draw a triangle.

   Run:      python draw_triangle.py

   Input:    None, except to terminate the program, click X to close the 
             window
   Output:   A window with a square in it
"""

from TurtleWorld import *

def draw_tri(t, leng):     
   """Draw a triangle with sides having length leng using the Turtle t 
   """
   for i in range(3):
      fd(t, leng)
      lt(t, 120)

world = TurtleWorld() # Create an instance of TurtleWorld -- i.e, a window
bob = Turtle()        # Create an instance of a Turtle
print bob

leng = int(raw_input("How long should the triangle's sides be?\n   "))

draw_tri(bob, leng)

wait_for_user()