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本例，展示了通过登录界面打开主界面的实现方式。

其中，登录的账号与密码判断都比较简单，请大家根据自己需要，自行完善补充。

【如下代码，完全复制，直接运行，即可使用】

import sys

from PyQt5.QtWidgets import *

from PyQt5.QtCore import *

from PyQt5.QtGui import *

################################################

#######创建主窗口

################################################

class MainWindow(QMainWindow):

def __init__(self, *args, **kwargs):

super().__init__(*args, **kwargs)

self.setWindowTitle('主界面')

self.showMaximized()

################################################

#######对话框

################################################

class logindialog(QDialog):

def __init__(self, *args, **kwargs):

super().__init__(*args, **kwargs)

self.setWindowTitle('登录界面')

self.resize(200, 200)

self.setFixedSize(self.width(), self.height())

self.setWindowFlags(Qt.WindowCloseButtonHint)

###### 设置界面控件

self.frame = QFrame(self)

self.verticalLayout = QVBoxLayout(self.frame)

self.lineEdit_account = QLineEdit()

self.lineEdit_account.setPlaceholderText("请输入账号")

self.verticalLayout.addWidget(self.lineEdit_account)

self.lineEdit_password = QLineEdit()

self.lineEdit_password.setPlaceholderText("请输入密码")

self.verticalLayout.addWidget(self.lineEdit_password)

self.pushButton_enter = QPushButton()

self.pushButton_enter.setText("确定")

self.verticalLayout.addWidget(self.pushButton_enter)

self.pushButton_quit = QPushButton()

self.pushButton_quit.setText("取消")

self.verticalLayout.addWidget(self.pushButton_quit)

###### 绑定按钮事件

self.pushButton_enter.clicked.connect(self.on_pushButton_enter_clicked)

self.pushButton_quit.clicked.connect(QCoreApplication.instance().quit)

def on_pushButton_enter_clicked(self):

# 账号判断

if self.lineEdit_account.text() == "":

return

# 密码判断

if self.lineEdit_password.text() == "":

return

# 通过验证，关闭对话框并返回1

self.accept()

################################################

#######程序入门

################################################

if __name__ == "__main__":

app = QApplication(sys.argv)

dialog = logindialog()

if dialog.exec_()==QDialog.Accepted:

the_window = MainWindow()

the_window.show()

sys.exit(app.exec_())