import sys
from PyQt5 import QtCore, QtGui, QtWidgets
import user_data


class MainWindow(object):

    def user_data(self):
        self.user_data_window = QtWidgets.QMainWindow()
        self.next_window = user_data.Ui_UserData()
        self.next_window.setupUi(self.user_data_window)
        main_window.hide()
        self.user_data_window.show()

    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(640, 480)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.label = QtWidgets.QLabel(self.centralwidget)
        self.label.setGeometry(QtCore.QRect(140, 100, 361, 81))
        font = QtGui.QFont()
        font.setPointSize(24)
        font.setBold(True)
        font.setWeight(75)
        self.label.setFont(font)
        self.label.setObjectName("label")
        self.pushButton = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton.setGeometry(QtCore.QRect(260, 260, 75, 51))
        self.pushButton.setObjectName("pushButton")
        self.pushButton.clicked.connect(self.user_data)
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 640, 21))
        self.menubar.setObjectName("menubar")
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")

        MainWindow.setStatusBar(self.statusbar)
        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "Main Window"))
        self.label.setText(_translate("MainWindow", " Manager"))
        self.pushButton.setText(_translate("MainWindow", "Lets Start!"))


if __name__ == "__main__":
    app = QtWidgets.QApplication(sys.argv)
    main_window = QtWidgets.QMainWindow()
    ui = MainWindow()
    ui.setupUi(main_window)
    main_window.show()
    sys.exit(app.exec_())

from PyQt5 import QtCore, QtGui, QtWidgets
import start_recording
class Ui_UserData(object):

    def start_record(self):
        self.window = QtWidgets.QMainWindow()
        self.ui = start_recording.Ui_StartRecording()
        self.ui.setupUi(self.window)
        """
        This is the part not working
        """
        MainWindow.hide()
        self.window.show()

    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(640, 480)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.groupBox_speaker_data = QtWidgets.QGroupBox(self.centralwidget)
        self.groupBox_speaker_data.setGeometry(QtCore.QRect(80, 30, 481, 381))
        sizePolicy = QtWidgets.QSizePolicy(QtWidgets.QSizePolicy.Preferred, QtWidgets.QSizePolicy.Preferred)
        sizePolicy.setHorizontalStretch(0)
        sizePolicy.setVerticalStretch(84)
        sizePolicy = QtWidgets.QSizePolicy(QtWidgets.QSizePolicy.Preferred, QtWidgets.QSizePolicy.Preferred)
        self.groupBox_speaker_data.setSizePolicy(sizePolicy)
        font = QtGui.QFont()
        font.setBold(True)
        font.setWeight(75)
        self.groupBox_speaker_data.setFont(font)
        self.groupBox_speaker_data.setObjectName("groupBox_speaker_data")
        self.label_name = QtWidgets.QLabel(self.groupBox_speaker_data)
        self.label_name.setGeometry(QtCore.QRect(30, 60, 47, 13))
        self.label_name.setObjectName("label_name")
        self.label_age = QtWidgets.QLabel(self.groupBox_speaker_data)
        self.label_age.setGeometry(QtCore.QRect(30, 120, 47, 13))
        self.label_age.setObjectName("label_age")
        self.label_id = QtWidgets.QLabel(self.groupBox_speaker_data)
        self.label_id.setGeometry(QtCore.QRect(30, 90, 47, 13))
        self.label_id.setObjectName("label_id")
        self.label_gender = QtWidgets.QLabel(self.groupBox_speaker_data)
        self.label_gender.setGeometry(QtCore.QRect(30, 150, 47, 13))
        self.label_gender.setObjectName("label_gender")
        self.lineEdit_name = QtWidgets.QLineEdit(self.groupBox_speaker_data)
        self.lineEdit_name.setGeometry(QtCore.QRect(110, 60, 141, 20))
        self.lineEdit_name.setObjectName("lineEdit_name")
        self.lineEdit_id = QtWidgets.QLineEdit(self.groupBox_speaker_data)
        self.lineEdit_id.setGeometry(QtCore.QRect(110, 90, 141, 20))
        self.lineEdit_id.setObjectName("lineEdit_id")
        self.spinBox_age = QtWidgets.QSpinBox(self.groupBox_speaker_data)
        self.spinBox_age.setGeometry(QtCore.QRect(110, 120, 42, 22))
        sizePolicy = QtWidgets.QSizePolicy(QtWidgets.QSizePolicy.Minimum, QtWidgets.QSizePolicy.Minimum)
        sizePolicy.setHorizontalStretch(18)
        sizePolicy.setVerticalStretch(78)
        self.spinBox_age.setSizePolicy(sizePolicy)
        self.spinBox_age.setMinimum(18)
        self.spinBox_age.setObjectName("spinBox_age")
        self.comboBox_gender = QtWidgets.QComboBox(self.groupBox_speaker_data)
        self.comboBox_gender.setGeometry(QtCore.QRect(110, 150, 69, 22))
        self.comboBox_gender.setObjectName("comboBox_gender")
        self.comboBox_gender.addItem("")
        self.comboBox_gender.addItem("")
        self.comboBox_gender.addItem("")
        self.pushButton = QtWidgets.QPushButton(self.groupBox_speaker_data)
        self.pushButton.setGeometry(QtCore.QRect(370, 330, 75, 23))
        self.pushButton.setObjectName("pushButton")

        self.pushButton.clicked.connect(self.start_record)

        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 640, 21))
        self.menubar.setObjectName("menubar")
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)

        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "User Data"))
        self.groupBox_speaker_data.setTitle(_translate("MainWindow", "Speaker Data"))
        self.label_name.setText(_translate("MainWindow", "Name:"))
        self.label_age.setText(_translate("MainWindow", "Age:"))
        self.label_id.setText(_translate("MainWindow", "ID:"))
        self.label_gender.setText(_translate("MainWindow", "Gender:"))
        self.comboBox_gender.setItemText(0, _translate("MainWindow", "Male"))
        self.comboBox_gender.setItemText(1, _translate("MainWindow", "Female"))
        self.comboBox_gender.setItemText(2, _translate("MainWindow", "Unknown"))
        self.pushButton.setText(_translate("MainWindow", "NEXT"))


if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    MainWindow = QtWidgets.QMainWindow()
    ui = Ui_UserData()
    ui.setupUi(MainWindow)
    MainWindow.show()
    sys.exit(app.exec_())

from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_StartRecording(object):

    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(640, 480)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.label = QtWidgets.QLabel(self.centralwidget)
        self.label.setGeometry(QtCore.QRect(160, 120, 331, 91))
        font = QtGui.QFont()
        font.setFamily("Arial Black")
        font.setPointSize(18)
        font.setBold(True)
        font.setWeight(75)
        self.label.setFont(font)
        self.label.setObjectName("label")
        self.label_2 = QtWidgets.QLabel(self.centralwidget)
        self.label_2.setGeometry(QtCore.QRect(260, 200, 101, 51))
        font = QtGui.QFont()
        font.setPointSize(14)
        font.setBold(True)
        font.setWeight(75)
        self.label_2.setFont(font)
        self.label_2.setObjectName("label_2")
        self.pushButton = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton.setGeometry(QtCore.QRect(260, 260, 75, 23))
        self.pushButton.setObjectName("pushButton")
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 640, 21))
        self.menubar.setObjectName("menubar")
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)
        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
        self.label.setText(_translate("MainWindow", "Lets begin"))
        self.label_2.setText(_translate("MainWindow", "xxx!"))
        self.pushButton.setText(_translate("MainWindow", "PushButton"))


if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    MainWindow = QtWidgets.QMainWindow()
    ui = Ui_StartRecording()
    ui.setupUi(MainWindow)
    MainWindow.show()
    sys.exit(app.exec_())