04-信号的操作（小案例1）.py

import sys

from PyQt5.Qt import *


class Window(QWidget):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("信号的操作案例")
        self.resize(500, 500)
        self.move(400, 250)
        self.setup_ui()

    def setup_ui(self):
        btn = QPushButton(self)
        btn.setText("点击我")

        def cao():
            print("点我干哈？")

        btn.clicked.connect(cao)


if __name__ == "__main__":
    app = QApplication(sys.argv)

    window = Window()
    window.show()

    sys.exit(app.exec_())