You said to us "Tkinter" module. If you are import the Tkinter module this like
from Tkinter import *
Generaly, this like use programmers. And use PIL module, We must know every module class names because its conflict.
Tkinter in Image module, PIL in Image module. Both .open attribute almost the same.
Solve,
import Tkinter as tk
if you are using Pillow or not, I advice to you, use to this like
from PIL import Image, ImageDraw, ImageFont
And lastly, You should String names to reference, for example,
class tryAgain(object):
def __init__(self):
self.referenceName = "Hell" + "o"
def run(self):
img = Image.open(self.referenceName)
#this like