test/main.py

import sys

from PyQt6.QtSql import QSqlDatabase, QSqlQuery
from PyQt6.QtWidgets import QApplication, QWidget, QVBoxLayout, QPushButton, QLineEdit, QMessageBox, QTableView, \
    QTableWidget, QTableWidgetItem


# db = QSqlDatabase.addDatabase('QPSQL')
# db.setHostName('10.30.0.137')
# db.setPort(5432)
# db.setUserName('gr692_zaa')
# db.setPassword('12345')
#
# if not db.open():
#     print(db.lastError().text())
#     raise SystemExit
#
# query = QSqlQuery(db)
# query.exec("""SELECT * FROM users""")
# while query.next():
#     print(query.value(1))


class MyApp(QWidget):
    def __init__(self):
        super().__init__()
        self.setFixedHeight(250)
        self.setFixedWidth(400)
        self.setWindowTitle('Авторизация')
        self.mainWindow = MainWindow()
        self.regWindow = RegWindow()

        self.loginEdit = QLineEdit()
        self.loginEdit.setFixedHeight(50)
        self.loginEdit.setPlaceholderText('Введите свой логин')

        self.passwordEdit = QLineEdit()
        self.passwordEdit.setEchoMode(QLineEdit.EchoMode.Password)
        self.passwordEdit.setFixedHeight(50)
        self.passwordEdit.setPlaceholderText('Введите свой пароль')

        authButton = QPushButton("Войти")
        authButton.setFixedHeight(60)
        authButton.clicked.connect(self.auth)

        regButton = QPushButton("Регистрация")
        regButton.setFixedHeight(40)
        regButton.clicked.connect(self.reg)

        vbox = QVBoxLayout()
        vbox.addWidget(self.loginEdit)
        vbox.addWidget(self.passwordEdit)
        vbox.addWidget(authButton)
        vbox.addStretch(1)
        vbox.addWidget(regButton)

        self.setLayout(vbox)

    def auth(self):
        login = self.loginEdit.text()
        password = self.passwordEdit.text()
        if login == 'asd':
            self.mainWindow.show()
        else:
            alert = QMessageBox()
            alert.setWindowTitle('Ошибка')
            alert.setText('Неверные данные!')
            alert.exec()

    def reg(self):
        myApp.close()
        self.regWindow.show()


class RegWindow(QWidget):
    def __init__(self):
        super().__init__()
        self.setFixedHeight(300)
        self.setFixedWidth(300)
        self.mainWindow = MainWindow()
        self.setWindowTitle('Регистрация')

        nameEdit = QLineEdit()
        nameEdit.setPlaceholderText('Введите своё имя')
        nameEdit.setFixedHeight(30)

        lastnameEdit = QLineEdit()
        lastnameEdit.setPlaceholderText('Введите свою фамилию')
        lastnameEdit.setFixedHeight(30)

        regButton = QPushButton('Зарегистрироваться')
        regButton.setFixedHeight(50)
        regButton.clicked.connect(self.reg)

        vbox = QVBoxLayout()
        vbox.addWidget(nameEdit)
        vbox.addWidget(lastnameEdit)
        vbox.addStretch(1)
        vbox.addWidget(regButton)

        self.setLayout(vbox)

    def reg(self):
        self.setWindowTitle('Квалификационный экзамен')
        self.close()
        self.mainWindow.show()


class TableView(QTableWidget):
    def __init__(self, data, *args):
        QTableWidget.__init__(self, *args)
        self.data = data
        self.setData()
        self.resizeColumnsToContents()
        self.resizeRowsToContents()

    def setData(self):
        for a in range(len(self.data)):
            for b in range(len(self.data[0])):
                self.setItem(b, a, QTableWidgetItem(self.data[a][b]))
        self.setHorizontalHeaderLabels(['123', '321', '222'])


class MainWindow(QWidget):
    def __init__(self):
        super().__init__()
        self.setFixedHeight(500)
        self.setFixedWidth(500)
        self.setWindowTitle('Квалификационный экзамен')

        data = [['1', '2', '3', '4'],
                ['1', '2', '1', '3'],
                ['1', '1', '2', '1']]

        table = TableView(data, 4, 3)

        layout = QVBoxLayout()
        layout.addWidget(table)

        self.setLayout(layout)


if __name__ == '__main__':

    app = QApplication(sys.argv)

    myApp = MyApp()
    myApp.show()

    app.exec()