Python-Tkinter Text Insert not affecting box

Question

First time poster, found the site very helpful before registering though. I am having issues using Tkinter on Python 2.7 (Windows7): The code (I have truncated it because the whole thing is massive) looks something like this:

-------------------------------------------------------
CODE:

    #set up stuff, importing variables, etc, then we have:
class App:
     global RXSerial
     RXSerial=''
#The following lines define the topFrame, lays out the widgets.
    def __init__(self, master):
        topFrame = Frame(master)
        topFrame.pack()

        middleFrame = Frame(master)
        middleFrame.pack()

#--------------defining state variables------------
        self.inputConsole = Text(middleFrame)
        self.inputConsole.insert(INSERT,"Data recieved from Serial:")
        self.inputConsole.config(width=100,height=20)
        self.inputConsole.pack(side=LEFT,padx=20,pady=20)

#blah blah blah, insert a bunch of stuff (buttons etc.) here:


#The following lines define the functions to be called when the buttons are pressed.
    def engineFire(self,engineUse,pwm): 
       RXSerial='this should pop up in the text called inputConsole'
       print RXSerial
       self.inputConsole.insert(INSERT, RXSerial)
---------------------------------------------------

so yeah, basically RXSerial is a string (that I have checked that is working, the print RXSerial line successfully prints when called by a button. The problem is that the self.inputConsole.insert(INSERT,RXSerial) line is not working. Can anybody please help? I have tried a bunch of combinations of stuff but cant seem to get it working. Thank you.

How do you call engineFire? Not from another thread, perchance? Tkinter, like most GUI frameworks, has thread affinity. Look here: effbot.org/zone/tkinter-threads.htm — atzz
– atzz, Commented Sep 5, 2012 at 6:41

Bryan Oakley · Accepted Answer · 2012-09-05 11:15:21Z

3

If you're trying to insert the text from another thread it may fail to work. Also, if at some point you configured the text widget to be in the disabled state then inserting will fail. If that's the case (widget is disabled), setting the state to "normal" temporarily will solve the problem.

Without more information it's impossible to say for sure.

answered Sep 5, 2012 at 11:15

Bryan Oakley

389k53 gold badges582 silver badges739 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

Sam Barrett Over a year ago

hey, thats the weird thing. im not currently using thread or threading (they are not even imported), and if i try to print a test string (eg. self.inputConsole.insert(INSERT,"blahblahblah") it will print fine. printing (to IDLE window) the variable also works fine, its just when you try to put them together.

Bryan Oakley Over a year ago

@LHC: have you verified that the widget is not disabled?

Collectives™ on Stack Overflow

Python-Tkinter Text Insert not affecting box

1 Answer 1

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related