I think the problem is that the time-consuming loop is preventing the tkinter
event loop, mainloop()
, from running. In other words, when your work intensive function runs in the same thread as the GUI, it interferes with it by hogging the interpreter.
To prevent this you can use a secondary Thread to run your function and run the GUI and its progressbar in the main thread. To give you an idea of how to do this, here's a simple example I derived from code in another (unrelated) progressbar question to show how easily something like that can be done. Note: It's generally recommended that secondary threads not be given direct access to the main thread's tkinter
objects.
from Tkinter import *
import ttk
import time
import threading
def foo():
time.sleep(5) # simulate some work
def start_foo_thread(event):
global foo_thread
foo_thread = threading.Thread(target=foo)
foo_thread.daemon = True
progressbar.start()
foo_thread.start()
root.after(20, check_foo_thread)
def check_foo_thread():
if foo_thread.is_alive():
root.after(20, check_foo_thread)
else:
progressbar.stop()
root = Tk()
mainframe = ttk.Frame(root, padding="3 3 12 12")
mainframe.grid(column=0, row=0, sticky=(N, W, E, S))
mainframe.columnconfigure(0, weight=1)
mainframe.rowconfigure(0, weight=1)
progressbar = ttk.Progressbar(mainframe, mode='indeterminate')
progressbar.grid(column=1, row=100, sticky=W)
ttk.Button(mainframe, text="Check",
command=lambda:start_foo_thread(None)).grid(column=1, row=200,
sticky=E)
for child in mainframe.winfo_children():
child.grid_configure(padx=5, pady=5)
root.bind('<Return>', start_foo_thread)
root.mainloop()
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