Returning a value after calling a function with a button in Tkinter

Question

from Tkinter import *
from tkFileDialog import askopenfilename
from PIL import Image
def main():
    filename = askopenfilename(filetypes=[(\"Jpeg\",\"*.jpg\")])
ret         


        

Answer 1

Generally, it is bad practice to use global variables to pass information around your program. However, if you really must do this, use a mutable data type (such as a list or a dict) as your global variable and change its contents from your callback function, main.

returned_values = {}    # Create an empty dict.
def main():
    returned_values['filename'] = askopenfilename(filetypes=[("Jpeg","*.jpg")])
    # returned_values['filename'] may now be accessed in the global scope.

If you intend to do this frequently, consider implementing your own class to pass information around.