Using StringVar and textvariable with a Python tkinter label

This lessons shows how the content of a variable can be 'linked' to a Python tkinter label, such that, whenever the variable is changed it is reflected in the label.

[@briansosa1613]

Ill be honest, this channel is one of the best clear tutorial ive ever seen.

[@johnphilipjones]

Thank you. Best wishes Phil (John Philip Jones)

[@ryantabeshi9565]

I had to stop this video halfway and just say thank you to a brilliant teacher

[@johnphilipjones]

Thank you for the generous comment. Best wishes Phil

[@orondavid4320]

Thank you very much, the way you come to explain the material is simply ingenious

[@raulcalimann7738]

I have to say you are a great teacher and the way you repeated and pointed out evrey little line of code was implemented in a very good way . Thank you very much for this video !

[@johnphilipjones]

Thank you for your positive comments it is appreciated. Best wishes Phil

[@airpods4]

I dunno why this channel is not famous yet, this video shows a great representation of this function especially for a slow learner like me and for some people who really wants to understand programming by not copy pasting code but understanding every each of them.

[@johnphilipjones]

Thank you for the positive comments. Best wishes Phil

[@nelsongg347]

A master class on Stringvar(), and behind the scenes a master class of English for all of us that use English as a second language. Thanks John!!!

[@Xardas_]

We need more teachers like this. Thanks you !

[@scition6139]

Simple vid yet you can understand everything more clearly than all the fancy vids out there. I left a like.

[@bishtss1]

Excellent way of teaching, animation makes the concept more clearer and easy to remember.

[@billrose5146]

I needed a Tkinter refresher as I debug some existing complex code. This step-by-step discussion was just what I needed. Thanks.

[@elonximperator892]

I just subscribed your channel I mentioned this because I subscribe only few selected channels which have great quality of content

[@CharlesSmall]

This is what i call - a very good teacher. Thank you.

[@setzz69]

You know a good teacher, when you see one; I am a doctor, trying to learn something different, and somehow I decided coding and then googling ended up with Python. I have read books on python and kept on practicing; I am doing tkinter now. I struggled with the concept of OOP; until I went through this clip by John Philip Jones- Simply brilliant. Thank you ever so much.

[@johnphilipjones]

Thank you for your positive feedback it is appreciated. I am glad you like the video. Check out the supporting website where all videos are organised. See the link below: www.PythonByteSize.com Best wishes Phil

[@isturizz]

Soy hispanohablante y aun así logré entender la explicación, cosa que no había logrado en otros tutoriales y web en español. GRACIAS!

[@johnphilipjones]

Thank you Best wishes Phil

[@atharvnikhare7113]

thanks for clearing the concept!!!👌🙌🙌

[@vladbalu6802]

Best Python tutorial ever! Thank you for spending time to teach others programming.

[@johnphilipjones]

It is pleasing to know that the videos are helping Best wishes Phil

[@mulandaafumba1677]

You're real teacher coder. Congrats

[@KevinSmith-qt4hz]

If only other people made videos like this, or you were insanely popular, many more people woud know how to code. This is perfect

[@SergeGilette]

Great video, with very simple and clear explanations. Thanks ! You've got a subscriber !

[@johnphilipjones]

Thank you for your positive feedback it is appreciated. Best wishes Phil

[@swagatbhowmik879]

Man truly fantastic explanation! Please make more videos like this. Every concept is crystal clear.

[@judeleon8485]

This is an excellent way of teaching. In fact, it's the best I have seen

[@johnphilipjones]

Thank you for your positive feedback it is appreciated. Best wishes Phil

[@spankowhat]

What a beast, simple animations, yet effective. Well done!

[@funnyclips2696]

Excellent...

[@patis.IA-AI]

great teacher thanks top !!

[@johnphilipjones]

Thank you! 😃

[@TheArchaeus6]

This is great. I can now replace loads of redundant code I used to change a label text. Much cleaner and functional. Thanks again.

[@imedayari1]

very very very nice and great tuto, thank you for sharing

[@saadsiddiqui9755]

I truly love your videos. Thank you very much for all these great explanations.

[@johnphilipjones]

Thank you for your positive feedback it is appreciated. Best wishes Phil

[@itzikovadia851]

very impressing and professional thanks

[@MaxGoddur]

Great to see you are diving into a deeper understanding of the code involving: var_1=StringVar() This line has confounded me ever since the first time it was introduced into the learning criteria. I am going back to re-watch this video till I understand it completely.

[@moltebin]

Good teacher

[@johnphilipjones]

Thank you! 😃

[@parthjangid3587]

You made is very easy to understand thank you sir!!

[@marcdurand2617]

You explain VERY well, thank you

[@abderahimmazouz2088]

v= StringVar() v.set("THANK YOU")

[@johnphilipjones]

😊👍

[@deveshkumar6533]

Your videos are really awesome ...please keep this good work .....

[@mr.moonlight3000]

Thank you very much for this perfect video. It was exactly what I needed.

[@IoniB]

Thank you so much!!

[@xpertutorialseo2]

very good explanation!

[@baibars5191]

Thanks

[@Maelzelmusic]

Thank you very much sir

[@aksharkashyap5492]

mind blowing

[@Saveg36]

i get it now

[@one_mega_ohm9139]

Any tips if I am trying to get a constantly updating variable (voltage) to update on the tkinter GUI? Thanks to this video, I can get one instance of the variable to show up in the window (in replace of "Hi"), but I'd like it to update every 3 seconds or so. The normal code has delay = 3... time.sleep(delay)... at the end, but when I add the Tk GUI I think the my_window.mainloop() blocks the loop??

[@johnphilipjones]

I would recommend using threads. Best wishes Phil

[@neouia777]

I am Arabic and my level in English is bed but i understand Thanks

[@MaxGoddur]

Would this be a way to carry out this scenario? I have a Tkinter GUI program which searches for files by extension then copies them to the path requested. What would be great is everytime a file is found matching the criteria it would show up in the GUI box in some sort of text listing window. Would this be possible using the var_1=StringVar()? If so look forward to seeing how it is done if and when it is scheduled.

[@johnphilipjones]

Will be covering techniques over the coming videos that will enable you to do this. Best wishes Phil

[@techpal5525]

How to restrict an Entry box with characters? I only want users to put strictly 0-9 number . or.. how do I fix TclError, when a user puts a string in the Entry Box ?

[@johnphilipjones]

I will do a video on how to do it. Best wishes Phil

[@wallacesantos0]

Can we use StringVar in a font somehow? So we can change the fontsize of the entire program

[@johnphilipjones]

Read in an integer from the GUI storing it in StringVar (convert to an integer). Then use this integer to set the font size attribute of the widget you require altering.Best wishesPhil

[@la77y8]

So, does the Python calculation loop go inside the tk window loop or does the tk window loop go inside the python calculation loop?

[@johnphilipjones]

The calculation would go inside a function or method. The function (or method) would typically be bound to the click event of a button. The program when executing would enter the mainloop. A click on the button causes an event. The program would then execute the function bound to the button click event (i.e. the calculation). When the execution of the function is complete the program returns to executing the mainloop.

[@la77y8]

@@johnphilipjones Right, I understand that. I think I'm struggling with the GUI paradigm. window.mainloop() is waiting for an event. I want to read a sensor and update the text in a label. I can do that once with a button click. If I define a function that reads a sensor periodically, I don't see a clean way to trigger an event to update the label then read the sensor again. Thanks for the reply.

[@johnphilipjones]

I would recommend that you use threads. Have the GUI in one thread and a timer in another thread. Every 'unit of time' read the sensor with an handler (method/function) that both reads the sensor and also updates the GUI. This is not easy as it involves an understanding of threads and communicating between threads. It is something I will eventually be covering but is will be quite a while off before I finish other topics but I will get around to it. Best wishes Phil

[@hyperconnected9809]

hey can help me with my tkinter im trying to display real time data.. please help

[@johnphilipjones]

Could you supply me with more details of the specification? Best wishes Phil

[@mh5854]

thanks