pyqt 实现QlineEdit 输入密码显示成圆点的方法

import structfrom PyQt5.QtWidgets import (QMessageBox, QLineEdit)from PyQt5.QtGui import QPixmap{...}class LoginWindow(QtWidgets.QWidget):{...}  def __init__(self):    super(LoginWindow, self).__init__()    # 加载ui文件    loadUi('login.ui', self)    # 设置背景图片    background = QPixmap("img/login_background.jpeg")    background = background.scaled(self.background_label.width(),self.background_label.width())    self.background_label.setPixmap(background)    # 设置输入密码框    self.passwd_lineEdit.setEchoMode(QLineEdit.Password){.......}def mainpage():  app = QtWidgets.QApplication(sys.argv)  login_window = LoginWindow()  login_window.show()  sys.exit(app.exec_())