使用PyQt5完成登陆进入主窗体

login.py

import sys
from PyQt5 import QtWidgets, QtCore
from PyQt5.QtWidgets import QMessageBox
import ui_login
import main

class frmLogin(QtWidgets.QWidget, ui_login.Ui_frmLogin):
    def __init__(self):
        super(frmLogin, self).__init__()
        self.setupUi(self)
        self.setWindowFlags(QtCore.Qt.WindowMinimizeButtonHint)  #禁止最大化按钮

    # 创建槽函数 槽函数直接使用元件的名称：on_元件名称_信号名称(槽装饰器, 区分参数)
    @QtCore.pyqtSlot()                                           #@QtCore.pyqtSlot(bool)
    def on_btnLogin_clicked(self):                               #自动对应click
        user = self.edtUser.text().strip()
        passwd = self.edtPasswd.text().strip()
        if user == "":
            QMessageBox.warning(self,"警告","用户号不能为空，请输入！")
            return
        if passwd == "":
            QMessageBox.warning(self,"警告","密码不能为空，请输入！")
            return
        if len(user) != 7:
            QMessageBox.warning(self,"警告","用户号长度必须为7位！")
            return
        if len(passwd) < 6:
            QMessageBox.warning(self,"警告","密码长度不能小于6位！")
            return
        if passwd != '123456':
            QMessageBox.warning(self,"警告","密码不符无法登陆!")
            return

        frmMain.show()            #打开新窗口
        self.close()              #关闭本窗口

if __name__ == '__main__':
    app = QtWidgets.QApplication(sys.argv)
    frmLogin = frmLogin()
    frmMain = main.frmMain()
    frmLogin.show()
    sys.exit(app.exec_())
--------------------------------------------------------------------------
main.py

from PyQt5 import QtWidgets
from PyQt5.QtWidgets import QMessageBox
from PyQt5.QtCore import Qt
import ui_main

class frmMain(QtWidgets.QMainWindow, ui_main.Ui_frmMain):
    def __init__(self):
        super(frmMain, self).__init__()
        self.setupUi(self)

    def closeEvent(self, event):
        reply = QMessageBox.question(self,'提示信息',"您是否退出程序?", QMessageBox.Yes | QMessageBox.No, QMessageBox.No)
        if reply == QMessageBox.Yes:
            event.accept()
        else:
            event.ignore()

    def keyPressEvent(self, e):
        if e.key() == Qt.Key_Escape:
            self.close()