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POCalling an external function that contains 'time.sleep()' within a Tkinter window
 

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  1. POCalling an external function that contains 'time.sleep()' within a Tkinter window
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    <p>I am attempting to call an external function from the press of a button in a Tkinter GUI; the function 'insert's into a Text element. This works perfectly; as long as it is not followed closely by time.sleep(). If it isn't followed, the text updates correctly; if it is, the text does not update, though the function still seems to be running the loop, as it will happily print text to the console.</p> <p>Here's my example script:</p> <pre><code>from Tkinter import * from time import sleep def test_function(gui_self): while True: print "Debug message" gui_self.main_.insert(END, "Test") class GUI: def __init__(self, master): frame = Frame(master, width=300, height=500) frame.pack() self.main_ = Entry(frame, width=80, justify=CENTER) self.main_.pack() test_function(self) root = Tk() application = GUI(root) root.mainloop() </code></pre> <p>This works well. However, changing test_function to the following seems to mess things up:</p> <pre><code>def test_function(gui_self): while True: print "Debug message" gui_self.main_.insert(END, "Test") sleep(5) </code></pre> <p>Any suggestions to fix whatever it is that I am doing wrong here? I'm sure it's just an issue that I, as a fairly basic level user, am not using the correct syntax for. </p> <p>As a side note, the 'sleep' command also seems to freeze the program entirely, which I find rather annoying and unattractive. Is there a method to pause the loop for a variably set (eg, var = 1(second)) amount of time, other than 'pipe'ing threads, that would be efficient and more.. clean? </p> <p>Thanks.</p>
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    1. CORead up on event loops. Basically, while the program is stuck inside your function, it can't update the GUI. There's a good resource for tkinter here: http://effbot.org/tkinterbook/tkinter-events-and-bindings.htm
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