Tortoise Program

def runSimpleTortoiseProgram(program, winWidth=500, winHeight=500):
    root = Tk()
    root.resizable(width=False, height=False)  # prevents resizing window
    canvas = Canvas(root, width=winWidth, height=winHeight)
    canvas.configure(bd=0, highlightthickness=0)
    canvas.pack()
    gray = rgbString(209, 208, 206)  # define color gray
    color = "none"  # start with no color
    degree = 0  # start with 0 degree
    x, y = winWidth/2, winHeight/2  # start at center
    for line in program.splitlines():
        # skip line when line does not content commands
        if line.startswith("#") or line in string.whitespace:
            continue
        flag1, flag2 = True, True
        # assign the first word to command, second word to value, and ignore the rest
        for word in line.split(" "):
            if flag1:
                command = word
                flag1 = False
            elif flag2:
                value = word
                flag2 = False
            else: break
        if command == "color":  # change color
            color = value
        elif command == "move":
            if color != "none":  # draw a line only when color is not "none"
                canvas.create_line(x, y, x + int(value) * math.cos(degree),
                                   y - int(value) * math.sin(degree), fill=color, width=4)
            # set the current point to the end of the new line (new position when no color)
            x, y = x + (int(value) * math.cos(degree)), \
                   y - (int(value) * math.sin(degree))
        elif command == "left":  # change angle counterclockwise
            degree = (degree + ((int(value) * 2 * math.pi) / 360))
        elif command == "right":  # change angle clockwise
            degree = (degree - ((int(value) * 2 * math.pi) / 360))
    canvas.create_text(10, 10, text=program, anchor=NW,
                       fill=gray, font="Times 10")  # print text
    root.mainloop()
    
def testRunSimpleTortoiseProgram():
    runSimpleTortoiseProgram("""
# Y
color red
right 45
move 50
right 45
move 50
right 180
move 50
right 45
move 50
color none # space
right 45
move 25

# E
color green
right 90
move 85
left 90
move 50
right 180
move 50
right 90
move 42
right 90
move 50
right 180
move 50
right 90
move 43
right 90
move 50  # space
color none
move 25

# S
color blue
move 50
left 180
move 50
left 90
move 43
left 90
move 50
right 90
move 42
right 90
move 50
""")

testRunSimpleTortoiseProgram()