QTimer

import sys
from PyQt6.QtWidgets import QMainWindow, QApplication, QPushButton, QMessageBox
from PyQt6.QtCore import QTimer
class QWindow(QMainWindow):
    def __init__(self):
        super().__init__()
        self.resize(180,150)
        self.initUI()
    def initUI(self):
        self.btn = QPushButton('发送验证码',self)
        self.btn.clicked.connect(self.btnclicked)
    # 创建计时器
        self.time = QTimer(self)
    # 设置计时器时间间隔(单位：ms;1s = 1000ms)
        self.time.setInterval(1000)
    # 计时器每经过一个时间间隔，便发出一次信号
        self.time.timeout.connect(self.Refresh)
        self.count = 10
        self.resize(180,60)
        self.setCentralWidget(self.btn)
        self.show()
    def btnclicked(self):
        if self.btn.isEnabled():
    # 使用计时器
            self.time.start()
    # 按钮不可用
            self.btn.setEnabled(False)
    def Refresh(self):
        if self.count > 0:
            self.btn.setText(str(self.count)+'秒后重发')
            self.count -= 1
        else:
            self.time.stop()
    # 按钮可用
            self.btn.setEnabled(True)
            self.btn.setText('发送验证码')
            self.count = 10
def main():
    app = QApplication(sys.argv)
    qw = QWindow()
    sys.exit(app.exec())
if __name__ == '__main__':
    main()

QTimer Class | Qt Core 6.3.2