PyQt not responding with example code

Samuel Bachorik

Hello i made simple code like this. While my function is counting my program is not responding.

Please can somebody show me how to change this code to get it work with that "Threads" thing ?

THANK YOU !

import sys
from PyQt5 import QtWidgets
from PyQt5.QtWidgets import *



class Window(QMainWindow):

   def __init__(self):
       super().__init__()

       self.setFixedSize(300, 300)
       self.move(100,100)
       self.setWindowTitle("Hello")

       self.label = QLabel(self)
       self.label.setText("Not done")
       self.label.resize(400,500)
       self.label.move(0,5)


       self.b1 = QtWidgets.QPushButton(self)
       self.b1.setText("Count")
       self.b1.move(100, 120)
       self.b1.resize(130, 32)
       self.b1.clicked.connect(self.Count)

       self.show()

   def Count(self):
       self.i = 0

       while self.i != 50000000:
              self.i +=1

       self.label.setText("DONE")





if __name__ == "__main__":
    app = QApplication(sys.argv)
    window = Window()
    sys.exit(app.exec())

SGaist

Hi,

Because your counting loop is blocking Qt's event loop.

Samuel Bachorik

And how can i improve this code to not doing it ? Can you tell me what to add to this code ? Please.

SGaist

If you want to run long lasting tasks without blocking your GUI either use QtConcurrent or move it to another thread.

Samuel Bachorik

I just can not find on internet how to properly use this. Where to put this command or how to work with it.

SGaist

What command are you talking about ?

Samuel Bachorik

I mean this QtConcurrent. I dont know how to use it, where to put this thing in this code.

SGaist

Did you read the documentation I linked ?

unplug

@Samuel-Bachorik This tutorial about multithreading may help you solve your problem.

Samuel Bachorik

@unplug Thank you man !!!!!

Amarnath Reddy S

Hi Sir,
In threading is it possible to run with out sleep ?

jsulm

@Amarnath-Reddy-S said in PyQt not responding with example code:

In threading is it possible to run with out sleep ?

Yes, don't call sleep() then.
Keep in mind that the thread will consume 100% of one CPU core.