tkinter loop and serial write

by

Context

You use the Tkinter mainloop and a while-loop and now you want to put both together into one program.

while X:
    do_y()

and 

master.mainloop()

Solutions

There are several solutions for you.

  1. split the loop and use after to let the GUI call you back:

    def do_y2():
    do_y()
    if X:
        master.after(123, do_y2) # after 123 milli seconds this is called again
do_y2()
master.mainloop()

    For a more detailed answer see this answer by Bryan Oakley

  2. use guiLoop by me.

    from guiLoop import guiLoop # https://gist.github.com/niccokunzmann/8673951#file-guiloop-py
@guiLoop
def do_y2():
    while X:
        do_y()
        yield 0.123 # give the GUI 123 milli seconds to do everything
do_y2(master)
master.mainloop()

    guiLoop uses the approach from 1. but allows you to use one or more while loops.

  3. use update to refresh the GUI.

    while X:
    do_y()
    master.update()

    This approach is an unusual one since it replaces the mainloop that is part os the most GUI frameworks like Tkinter. Note that with 1 and 2 you can have multiple loops, not just one as in 3.

  4. use a new thread of execution that executes your loop in parallel. ! This thread must not access master or any GUI elements directly because Tkinter can crash then!

    import threading
def do_y_loop():
     while X:
         do_y()
thread = threading.Thread(target = do_y_loop)
thread.deamon = True # use this if your application does not close.
thread.start()
master.mainloop()

  5. start the mainloop in a new thread. As in 4. Tkinter can crash if you access the GUI from the thread.

    import threading
thread = threading.Thread(target = master.mainloop)
thread.deamon = True # use this if your application does not close.
thread.start()
while X:
    do_y()

    In both 4. and 5. communication between the GUI and the while-loop could/should go through global variables but never through tkinter methods.

For PyQT see these questions:

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