Running threads with PyQt

abdelmoumene

Hi,

I am developing a PyQt application which requires running threads, I would like to know how to run a function in a Worker and at the same time update a progress bar.

The function runs from another python file, i did my import normally. But the function is not recognized when I put it at the run section of my worker

Please find the code below :

class WorkerT(QObject):
    finished = pyqtSignal()
    progress = pyqtSignal(int)

    def run(self):
        func_train()
        while True:
            i = 1
            self.progress.emit(i)
            time.sleep(1)
        self.finished.emit()

SGaist

Hi and welcome to devnet,

Do you mean "func_train" ?

abdelmoumene

Yes, the function is called "func_train", I imported it from a second python file. I would like to execute it at run section and update a progress bar at the same time to show the progress of the execution of this function.

JonB

@abdelmoumene said in Running threads with PyQt:

But the function is not recognized

What exactly do you mean by this? Do you get an error message? When it runs the line or when it reads the file & imports? Please paste any error message.

abdelmoumene

I have this error, when I try to debug my application although I have imported the "load.py" file:

(<class 'AttributeError'>, AttributeError ("module 'load' has no attribute 'func_load'"), <traceback object at 0x0000023CA2233B48>)

JonB

@abdelmoumene
I don't see why the error message states func_load when you say your code has func_train(). I don't know whether putting it inside run() is relevant.

abdelmoumene

I would also like to know if the function "func_train" should be executed inside the while to update the progress bar (the percentage) at the same time or do I have to do this differently?

abdelmoumene

@JonB This is to execute the function in a thread (to avoid freezing the GUI) and at the same time update the percentage of a progress bar that I created.

SGaist

How exactly are you importing that function ?

abdelmoumene

@SGaist

import load
from load import *

JonB

@abdelmoumene
Why do you effectively import twice? Use one or the other? (And preferably not from load import *.)

abdelmoumene

Hi,

Can you tell me how to run the function and update the progress bar at the same time?

Thank you.

SGaist

Well, if your function is blocking for a long time then you won't be able to update the progress bar the way you want.

It's up to you to implement it in such a way that it reports progress that can then be used to update the progress bar.

So what does it do ?

abdelmoumene

@SGaist I would like to update the progress bar during the execution of this task so that it shows the execution progress, do you have a solution for me?

SGaist

Not knowing what this task does nor how it is implemented I can only suggest the same thing as my previous answer.

dimk

Here is an example of QThread and progressBar.
https://stackoverflow.com/questions/68189289/pyqt5-qthread-process-finished-with-exit-code-139-interrupted-by-signal-11-sig/68195024#68195024