pyqt implement QlineEdit to display the password in dots.

import struct
from  import (QMessageBox, QLineEdit)
from  import QPixmap
{...}

class LoginWindow():
{...}
  def __init__(self):
    super(LoginWindow, self).__init__()
    # Load ui file
    loadUi('', self)
    # Setting the background image
    background = QPixmap("img/login_background.jpeg")
    background = (self.background_label.width(),self.background_label.width())
    self.background_label.setPixmap(background)
    # Set up the input password box
    self.passwd_lineEdit.setEchoMode()
{.......}

def mainpage():
  app = ()
  login_window = LoginWindow()
  login_window.show()
  (app.exec_())