How to redirect in real time STDOUT from imported module to Tkinter Text Widget in python?

I am trying to redirect stdout into a Tkinter Text widget in real time using Python 2.7.2 on Windows 7. In my code below, I intended to have a print statement appear in the Text widget every 2 seconds. What happens, instead, is that all 3 lines ``` Received sleep-command Going to sleep for 2 s Just woke up ``` appear simultaneously as soon as both sleep() and mod1.main() have been evaluated. Surprisingly (to me, at least) the problem disappears when I do not redirect stdout. That is, if I comment out the line ``` sys.stdout = StdoutRedirector(outputPanel) ``` IDLE displays the print statements in real time. Can somebody explain this to me and suggest a way to get around it? Thanks in advance! Here is my example code: mod1.py ``` import time import sys def main(): print('Going to sleep for 2 s') time.sleep(2) print('Just woke up') ``` text_GUI.py ``` from Tkinter import * import sys import time import mod1 old_stdout = sys.stdout class StdoutRedirector(object): def __init__(self, text_area): self.text_area = text_area def write(self, str): self.text_area.insert(END, str) self.text_area.see(END) def sleep(): print('Received sleep-command') time.sleep(2) mod1.main() root = Tk() # Textbox outputPanel = Text(root, wrap='word', height = 11, width=50) outputPanel.grid(column=0, row=0, columnspan = 2, sticky='NSWE', padx=5, pady=5) sys.stdout = StdoutRedirector(outputPanel) # Sleep button sleepBtn = Button(root, text='Sleep', command=sleep) sleepBtn.grid(row=1, column=1, sticky='E', padx=5, pady=5) root.mainloop() sys.stdout = old_stdout ```