import sys
from PyQt5.QtCore import QThread, pyqtSignal
from PyQt5.QtWidgets import QApplication, QLabel, QPushButton, QVBoxLayout, QWidget

# Worker Thread
class Worker(QThread):
    progress = pyqtSignal(int)  # Signal to send data to the main thread

    def run(self):
        for i in range(100):
            self.sleep(1)  # simulate long task
            self.progress.emit(i)  # emit progress update

# Main Window
class MainWindow(QWidget):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("QThread Example")
        self.setGeometry(100, 100, 300, 150)

        self.label = QLabel("Press Start", self)
        self.button = QPushButton("Start Long Task", self)
        self.button.clicked.connect(self.start_task)

        layout = QVBoxLayout()
        layout.addWidget(self.label)
        layout.addWidget(self.button)
        self.setLayout(layout)

    def start_task(self):
        self.worker = Worker()
        self.worker.progress.connect(self.update_label)
        self.worker.start()

    def update_label(self, value):
        self.label.setText(f"Count: {value}")

# Run the app
app = QApplication(sys.argv)
window = MainWindow()
window.show()
sys.exit(app.exec_())