# Homework #2 problem #3 answer -- a variant
#
# Matt Bishop, Jan. 18, 2012
# ECS 10, Winter Quarter 2012

# we need the turtle module to use turtles
import turtle
import time

#
# now make the turtle and window
#
wn = turtle.Screen()        # creates a playground for turtles
matt = turtle.Turtle()      # create a turtle, assign to matt

#
# read in the number of sides
#
try:        # read in a positive integer
    n = int(input("How many sides do you want? "))
except:     # opps . . . not an integer
    print("You must enter an integer that is at least 2")
else:
    if n < 2:
        print("Please enter an integer that is at least 2")
    else:
        # set the angle to turn at each coner
        angle = 360/n
        #
        # draw the polygon
        for i in range(0,n):
            matt.forward(500/n)     # draw the side
            matt.left(angle)        # rotate the turtle
        #
        # clean up; hide the turtle and block
        matt.hideturtle()
        time.sleep(5)               # wait 5 seconds
finally:
    wn.bye()                        # close window