pyqt/basic/events_1.py

import sys

from PyQt5.QtWidgets import QMainWindow, QLabel, QApplication


class MainWindow(QMainWindow):

    def __init__(self):
        super().__init__()
        self.label = QLabel("Click in this window")
        self.setCentralWidget(self.label)
        self.setMouseTracking(True)
        self.label.setMouseTracking(True)

    def mouseMoveEvent(self, event):
        self.label.setText("Mouse Moved")

    def mousePressEvent(self, event):
        self.label.setText("Mouse Press")

    def mouseReleaseEvent(self, event):
        self.label.setText("Mouse release")

    def mouseDoubleClickEvent(self, event):
        self.label.setText("Mouse Double Click")


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