CODEWITHSUNDEEP
pythonpyqt5qthread
Sherief El-Ghazawi
Sherief El-Ghazawi

Reputation: 197

QThread causing entire program to sleep in pyqt5

This is my first attempt at trying to subclass QThreads and use it in a program but I'm getting something kind of weird. I'm not sure if my constructor is wrong or something like that, but basically when I run my QThread the entire program sleeps (not just the thread) when the QThread is sleeping

For example, the provided code will print "Hello there" after 3 seconds which is how long the QThread is supposed to sleep for

How do I fix my code so that I can have my thread running in the background while the program is running

from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtCore import QThread, pyqtSignal
import time

class MyThread(QThread):
    def __init__(self):
        QThread.__init__(self)

    def __del__(self):
        self.wait()

    def run(self):
        self.sleep(3)
        print("Slept for 3 seconds")


def main():
    qThread = MyThread()
    qThread.run()

    print("Hello there")

main()

Upvotes: 0

Views: 407

Answers (2)

Baptiste Pouthier
Baptiste Pouthier

Reputation: 572

To complete ptolemy0's answer, i can share you the code i'm using to practice on Qt:

from PyQt5.QtCore import QThread
from PyQt5.QtWidgets import  QWidget, QApplication
import sys, time

class MyThread(QThread):
    def __init__(self, parent=None):
        super(MyThread, self).__init__(parent)

    def __del__(self):
        self.wait()

    def run(self):
        while True:
            self.sleep(3)
            print("Slept for 3 seconds")

class Main(QWidget):

    def __init__(self, parent=None):

        super(Main,self).__init__(parent)

        qThread = MyThread()
        qThread.start()

        i=0
        while True:

            print(i)
            i+=1
            time.sleep(1)



def main():

    app = QApplication(sys.argv)
    example = Main()

    print("Hello there")
    sys.exit(app.exec())

main()

Hope it can help you!

Upvotes: -1

ptolemy0
ptolemy0

Reputation: 809

Use start not run:

def main():
    qThread = MyThread()
    qThread.start()

    print("Hello there")

Since run is the starting point for the thread (which exists in case you wanted to reuse the code not in a thread),

whilst start is the method to start the thread itself, so it will in turn call run

Upvotes: 2

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