PyQt4在.py文件之间共享QLineEdit变量

Question

I want to pass self.user = QtGui.QLineEdit(MainWindow) variable from Login.py to officer = str(self.tocomb.currentText()) in ingooi.py

My 3 GUI windows

My program consists of various files where I import the classes from other files as needed.

The 3 main files consists of :

1. Login.py ( My Login window where user logs in )
2. page22.py ( User selects to enter/view data )
3. ingooi.py ( User enters data then adds the data to access database via Submit Button

Please see the code for these 3 main files below.

Login.py

from PyQt4 import QtCore, QtGui
from ingooi import Ui_NextPage
from page22 import Ui_Page1
import pypyodbc


try:
_fromUtf8 = QtCore.QString.fromUtf8  
except AttributeError:
    def _fromUtf8(s):
        return s

try:
    _encoding = QtGui.QApplication.UnicodeUTF8
    def _translate(context, text, disambig):
        return QtGui.QApplication.translate(context, text, disambig,   
_encoding)
except AttributeError:
    def _translate(context, text, disambig):
        return QtGui.QApplication.translate(context, text, disambig)

class Ui_Logged(object):

def setupUi(self, MainWindow):
    MainWindow.setObjectName(_fromUtf8("MainWindow"))
    MainWindow.resize(389, 235)
    self.centralwidget = QtGui.QWidget(MainWindow)
    self.centralwidget.setObjectName(_fromUtf8("centralwidget"))
    self.Login_button = QtGui.QPushButton(self.centralwidget)
    self.Login_button.setGeometry(QtCore.QRect(90, 150, 75, 23))    
    self.Login_button.setObjectName(_fromUtf8("Login_button"))


    self.user = QtGui.QLineEdit(MainWindow)


    self.user.setGeometry(QtCore.QRect(100, 30, 113, 20))
    self.user.setObjectName(_fromUtf8("user"))

    self.password = QtGui.QLineEdit(MainWindow)        
    self.password.setGeometry(QtCore.QRect(100, 70, 113, 20))
    self.password.setObjectName(_fromUtf8("password"))
    self.password.setEchoMode(QtGui.QLineEdit.Password)       
    self.user_label = QtGui.QLabel(self.centralwidget)
    self.user_label.setGeometry(QtCore.QRect(30, 30, 46, 13))
    self.user_label.setObjectName(_fromUtf8("user_label"))       
    self.Password_label = QtGui.QLabel(self.centralwidget)
    self.Password_label.setGeometry(QtCore.QRect(30, 70, 46, 13))
    self.Password_label.setObjectName(_fromUtf8("Password_label"))     
    self.status_label = QtGui.QLabel(self.centralwidget)
    self.status_label.setGeometry(QtCore.QRect(100, 110, 121, 16))   
    self.status_label.setText(_fromUtf8(""))    
    self.status_label.setObjectName(_fromUtf8("status_label"))
    MainWindow.setCentralWidget(self.centralwidget)
    self.menubar = QtGui.QMenuBar(MainWindow)
    self.menubar.setGeometry(QtCore.QRect(0, 0, 389, 21))
    self.menubar.setObjectName(_fromUtf8("menubar"))
    MainWindow.setMenuBar(self.menubar)
    self.statusbar = QtGui.QStatusBar(MainWindow)
    self.statusbar.setObjectName(_fromUtf8("statusbar"))
    MainWindow.setStatusBar(self.statusbar)
    self.retranslateUi(MainWindow)
    QtCore.QObject.connect(self.Login_button,   QtCore.SIGNAL(_fromUtf8("clicked()")), self.slot1)
    QtCore.QMetaObject.connectSlotsByName(MainWindow)

def retranslateUi(self, MainWindow):
    MainWindow.setWindowTitle(_translate("MainWindow", "Login ", None))
    self.Login_button.setText(_translate("MainWindow", "Login ", None))
    self.user_label.setText(_translate("MainWindow", "User", None))
    self.Password_label.setText(_translate("MainWindow", "Password", None))


def WW(self):

    self.window = QtGui.QMainWindow()
    self.ui = Ui_Page1()
    self.ui.setupUi(self.window)
    self.window.show()
    MainWindow.hide()


def slot1(self):

    uName = self.user.text()
    uPass = self.password.text()


    print uName
    print uPass


    conn = pypyodbc.connect('DRIVER={Driver do Microsoft Access     (*.mdb)};UID=admin;UserCommitSync=Yes;Threads=3;SafeTransactions=0;PageTimeout=5 
 ;MaxScanRows=8;MaxBufferSize=2048;FIL={MS     Access};DriverId=25;DefaultDir=//ICASACTNFS02/Share/New;DBQ=//ICASACTNFS02/Share/  New/snake.mdb')  


    cursor = conn.cursor()

    sql = "SELECT * FROM gtable WHERE User = '%s' AND pwd = '%s'"% 
 (uName,uPass)

    see = cursor.execute(sql)

    if (len (see.fetchall()) > 0) :

        print " User OK !"


        self.WW()

        conn.close()

    else:


        self.status_label.setText(_fromUtf8("Try ma wee"))



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

Page22.py

from PyQt4 import QtCore, QtGui  
from ingooi import Ui_NextPage  
from tafel import Ui_Main  
from tafel2 import Ui_TaPage  
import pypyodbc  
import sys  

try:
    _fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
    def _fromUtf8(s):
        return s

try:
    _encoding = QtGui.QApplication.UnicodeUTF8
    def _translate(context, text, disambig):
        return QtGui.QApplication.translate(context, text, disambig,   _encoding)
except AttributeError:
    def _translate(context, text, disambig):
        return QtGui.QApplication.translate(context, text, disambig)

class Ui_Page1(object):


def setupUi(self, Page1):
    Page1.setObjectName(_fromUtf8("Page1"))
    Page1.resize(586, 617)
    self.centralwidget = QtGui.QWidget(Page1)
    self.centralwidget.setObjectName(_fromUtf8("centralwidget"))
    self.pushButton = QtGui.QPushButton(self.centralwidget)
    self.pushButton.setGeometry(QtCore.QRect(130, 40, 300, 61))
    self.pushButton.setObjectName(_fromUtf8("pushButton"))

    self.pushButton.clicked.connect(self.dataenter)

    self.pushButton_2 = QtGui.QPushButton(self.centralwidget)
    self.pushButton_2.setGeometry(QtCore.QRect(130, 130, 291, 61))
    self.pushButton_2.setObjectName(_fromUtf8("pushButton_2"))

    self.pushButton_2.clicked.connect(self.dataview)

    self.pushButton_3 = QtGui.QPushButton(self.centralwidget)
    self.pushButton_3.setGeometry(QtCore.QRect(130, 220, 291, 61))
    self.pushButton_3.setObjectName(_fromUtf8("pushButton_3"))

    self.pushButton_3.clicked.connect(self.Taview)

    self.pushButton_4 = QtGui.QPushButton(self.centralwidget)
    self.pushButton_4.setGeometry(QtCore.QRect(130, 310, 291, 61))
    self.pushButton_4.setObjectName(_fromUtf8("pushButton_4"))


    self.pushButton_4.clicked.connect(self.exit)

    Page1.setCentralWidget(self.centralwidget)
    self.menubar = QtGui.QMenuBar(Page1)
    self.menubar.setGeometry(QtCore.QRect(0, 0, 586, 21))
    self.menubar.setObjectName(_fromUtf8("menubar"))
    Page1.setMenuBar(self.menubar)
    self.statusbar = QtGui.QStatusBar(Page1)
    self.statusbar.setObjectName(_fromUtf8("statusbar"))
    Page1.setStatusBar(self.statusbar)

    self.retranslateUi(Page1)
    QtCore.QMetaObject.connectSlotsByName(Page1)

def retranslateUi(self, Page1):
    Page1.setWindowTitle(_translate("Page1", "MainWindow", None))
    self.pushButton.setText(_translate("Page1", "Data Entry ", None))
    self.pushButton_2.setText(_translate("Page1", "View Data ", None))

    self.pushButton_3.setText(_translate("Page1", " Type Approved Device   
List    ", None))

    self.pushButton_4.setText(_translate("Page1", "EXIT ", None))

def dataenter(self):

    self.window = QtGui.QMainWindow()
    self.ui = Ui_NextPage()
    self.ui.setupUi(self.window)
    self.window.show()        

def dataview(self):

    self.window = QtGui.QMainWindow()
    self.ui = Ui_Main()
    self.ui.setupUi(self.window)
    self.window.show()

def Taview(self):

    self.window = QtGui.QMainWindow()
    self.ui = Ui_TaPage()
    self.ui.setupUi(self.window)
    self.window.show()


def exit(self):


    sys.exit()


if __name__ == "__main__":

    import sys

    app = QtGui.QApplication(sys.argv)
    Page1 = QtGui.QMainWindow()

    ui = Ui_Page1()
    ui.setupUi(Page1)
    Page1.show()
    sys.exit(app.exec_())

ingooi.py

from PyQt4 import QtCore, QtGui
import pypyodbc
from tafel import Ui_Main
import subprocess
import sys

try:
    _fromUtf8 = QtCore.QString.fromUtf8
 except AttributeError:
    def _fromUtf8(s):
        return s

try:
    _encoding = QtGui.QApplication.UnicodeUTF8
    def _translate(context, text, disambig):
        return QtGui.QApplication.translate(context, text, disambig,   _encoding)  
except AttributeError:
def _translate(context, text, disambig):
    return QtGui.QApplication.translate(context, text, disambig)

class Ui_NextPage(object):


def ViewPage(self):


    self.window = QtGui.QMainWindow()
    self.ui = Ui_Main()
    self.ui.setupUi(self.window)
    self.window.show()

def load(self):

    mydate = self.insp_date_comb.date()

    realdate = mydate.toString("dd/MM/yyyy")

    lic_name = str(self.lic_name_comb.currentText())
    lic_num = str(self.lic_nr_comb.currentText())
    systm = str(self.sys_name_comb.currentText())
    Loc = str(self.Loc_comb.currentText())

    txfreq = str(self.tx_comb.currentText())
    rxfreq = str(self.rx_comb.currentText())
    fwdpwr = str(self.fwdpwr_comb.currentText())  
    rflpwr = str(self.rflpwr_comb.currentText())

    officer  = str(self.tocomb.currentText()) 

    print lic_name
    print realdate


    conn = pypyodbc.connect('DRIVER={Driver do Microsoft Access   (*.mdb)};UID=admin;UserCommitSync=Yes;Threads=3;SafeTransactions=0;PageTimeout=5
;MaxScanRows=8;MaxBufferSize=2048;FIL={MS   Access};DriverId=25;DefaultDir=//ICASACTNFS02/Share/New;DBQ=//ICASACTNFS02/Share   /New/snake.mdb')
    cursor = conn.cursor()

    # query = "DELETE FROM measdata WHERE RFL_PWR = '%s'" %(0) 

    query = "INSERT INTO measdata     (Licensee,Lic_number,System,Location,Insp_date,TX,RX,FWD_PWR,RFL_PWR,TO) VALUES     ('%s','%s','%s','%s','%s','%s','%s','%s','%s','%s')" %   (lic_name,lic_num,systm,Loc,realdate,txfreq,rxfreq,fwdpwr,rflpwr,officer) 

    cursor.execute(query)

    conn.commit()

    conn.close()


def setupUi(self, MainWindow):
    MainWindow.setObjectName(_fromUtf8("MainWindow"))
    MainWindow.resize(544, 516)
    self.centralwidget = QtGui.QWidget(MainWindow)
    self.centralwidget.setObjectName(_fromUtf8("centralwidget"))
    self.lic_name_comb = QtGui.QComboBox(self.centralwidget)
    self.lic_name_comb.setGeometry(QtCore.QRect(120, 20, 181, 22))
    self.lic_name_comb.setEditable(True)
    self.lic_name_comb.setObjectName(_fromUtf8("lic_name_comb"))
    self.lic_name_comb.addItem(_fromUtf8(""))
    self.lic_name_comb.setItemText(0, _fromUtf8(""))
    self.lic_name_comb.addItem(_fromUtf8(""))
    self.lic_name_comb.addItem(_fromUtf8(""))
    self.lic_name_comb.addItem(_fromUtf8(""))

    self.label = QtGui.QLabel(self.centralwidget)
    self.label.setGeometry(QtCore.QRect(30, 20, 81, 31))
    self.label.setObjectName(_fromUtf8("label"))

    self.tolabel = QtGui.QLabel(self.centralwidget)
    self.tolabel.setGeometry(QtCore.QRect(30, 350, 70, 23))
    self.tolabel.setObjectName(_fromUtf8("tolabel"))

    self.label_2 = QtGui.QLabel(self.centralwidget)
    self.label_2.setGeometry(QtCore.QRect(30, 50, 71, 21))
    self.label_2.setObjectName(_fromUtf8("label_2"))
    self.lic_nr_comb = QtGui.QComboBox(self.centralwidget)
    self.lic_nr_comb.setGeometry(QtCore.QRect(120, 50, 101, 22))
    self.lic_nr_comb.setEditable(True)
    self.lic_nr_comb.setObjectName(_fromUtf8("lic_nr_comb"))
    self.lic_nr_comb.addItem(_fromUtf8(""))
    self.lic_nr_comb.setItemText(0, _fromUtf8(""))
    self.lic_nr_comb.addItem(_fromUtf8(""))
    self.lic_nr_comb.addItem(_fromUtf8(""))
    self.lic_nr_comb.addItem(_fromUtf8(""))
    self.label_8 = QtGui.QLabel(self.centralwidget)
    self.label_8.setGeometry(QtCore.QRect(30, 80, 71, 21))
    self.label_8.setObjectName(_fromUtf8("label_8"))
    self.sys_name_comb = QtGui.QComboBox(self.centralwidget)
    self.sys_name_comb.setGeometry(QtCore.QRect(120, 80, 101, 22))
    self.sys_name_comb.setEditable(True)
    self.sys_name_comb.setObjectName(_fromUtf8("sys_name_comb"))
    self.sys_name_comb.addItem(_fromUtf8(""))
    self.sys_name_comb.setItemText(0, _fromUtf8(""))

    self.sys_name_comb.addItem(_fromUtf8(""))
    self.sys_name_comb.addItem(_fromUtf8(""))
    self.sys_name_comb.addItem(_fromUtf8(""))
    self.sys_name_comb.addItem(_fromUtf8(""))
    self.sys_name_comb.addItem(_fromUtf8(""))
    self.sys_name_comb.addItem(_fromUtf8(""))

    self.insp_date_comb = QtGui.QDateEdit(self.centralwidget)
    self.insp_date_comb.setGeometry(QtCore.QRect(120, 150, 110, 22))
    self.insp_date_comb.setObjectName(_fromUtf8("insp_date_comb"))

    self.insp_date_comb.setDateTime(QtCore.QDateTime.currentDateTime())

    self.insp_date_comb.setCalendarPopup(True)

    self.label_9 = QtGui.QLabel(self.centralwidget)
    self.label_9.setGeometry(QtCore.QRect(30, 150, 81, 16))
    self.label_9.setObjectName(_fromUtf8("label_9"))

    self.submit_btn = QtGui.QPushButton(self.centralwidget)
    self.submit_btn.setGeometry(QtCore.QRect(20, 415, 70, 23))
    self.submit_btn.setObjectName(_fromUtf8("submit_btn"))

    self.submit_btn.clicked.connect(self.load)

    self.Loc_comb = QtGui.QComboBox(self.centralwidget)
    self.Loc_comb.setGeometry(QtCore.QRect(120, 110, 101, 22))
    self.Loc_comb.setEditable(True)
    self.Loc_comb.setObjectName(_fromUtf8("Loc_comb"))
    self.Loc_comb.addItem(_fromUtf8(""))
    self.Loc_comb.setItemText(0, _fromUtf8(""))
    self.Loc_comb.addItem(_fromUtf8(""))
    self.Loc_comb.addItem(_fromUtf8(""))
    self.label_10 = QtGui.QLabel(self.centralwidget)
    self.label_10.setGeometry(QtCore.QRect(30, 110, 71, 21))
    self.label_10.setObjectName(_fromUtf8("label_10"))

    self.rx_comb = QtGui.QComboBox(self.centralwidget)
    self.rx_comb.setGeometry(QtCore.QRect(120, 220, 69, 22))
    self.rx_comb.setEditable(True)
    self.rx_comb.setObjectName(_fromUtf8("rx_comb"))
    self.rx_comb.addItem(_fromUtf8(""))
    self.rx_comb.setItemText(0, _fromUtf8(""))
    self.rx_comb.addItem(_fromUtf8(""))
    self.rx_comb.addItem(_fromUtf8(""))
    self.rx_comb.addItem(_fromUtf8(""))
    self.rx_comb.addItem(_fromUtf8(""))
    self.rx_comb.addItem(_fromUtf8(""))

    self.tocomb = QtGui.QComboBox(self.centralwidget)
    self.tocomb.setGeometry(QtCore.QRect(120, 348, 110, 22))
    self.tocomb.setEditable(True)
    self.tocomb.setObjectName(_fromUtf8("rx_comb"))
    self.tocomb.addItem(_fromUtf8(""))
    self.tocomb.setItemText(0, _fromUtf8(""))
    self.tocomb.addItem(_fromUtf8("VAN NIEKERK B.A"))
    self.tocomb.addItem(_fromUtf8("ERASMUS C.M"))
    self.tocomb.addItem(_fromUtf8("FRANSMAN G.F"))
    self.tocomb.addItem(_fromUtf8("COOK H.A"))
    self.tocomb.addItem(_fromUtf8("MCQUIRE L."))
    self.tocomb.addItem(_fromUtf8("Gertse RS"))

    self.label_6 = QtGui.QLabel(self.centralwidget)
    self.label_6.setGeometry(QtCore.QRect(30, 220, 71, 21))
    self.label_6.setObjectName(_fromUtf8("label_6"))
    self.fwdpwr_comb = QtGui.QComboBox(self.centralwidget)
    self.fwdpwr_comb.setGeometry(QtCore.QRect(120, 280, 69, 22))
    self.fwdpwr_comb.setEditable(True)
    self.fwdpwr_comb.setObjectName(_fromUtf8("fwdpwr_comb"))
    self.fwdpwr_comb.addItem(_fromUtf8(""))
    self.fwdpwr_comb.setItemText(0, _fromUtf8(""))
    self.fwdpwr_comb.addItem(_fromUtf8(""))
    self.fwdpwr_comb.addItem(_fromUtf8(""))
    self.fwdpwr_comb.addItem(_fromUtf8(""))
    self.rflpwr_comb = QtGui.QComboBox(self.centralwidget)
    self.rflpwr_comb.setGeometry(QtCore.QRect(120, 310, 69, 22))
    self.rflpwr_comb.setEditable(True)
    self.rflpwr_comb.setObjectName(_fromUtf8("rflpwr_comb"))
    self.rflpwr_comb.addItem(_fromUtf8(""))
    self.rflpwr_comb.setItemText(0, _fromUtf8(""))
    self.rflpwr_comb.addItem(_fromUtf8(""))
    self.rflpwr_comb.addItem(_fromUtf8(""))
    self.rflpwr_comb.addItem(_fromUtf8(""))
    self.rflpwr_comb.addItem(_fromUtf8(""))
    self.rflpwr_comb.addItem(_fromUtf8(""))
    self.label_4 = QtGui.QLabel(self.centralwidget)
    self.label_4.setGeometry(QtCore.QRect(30, 310, 71, 21))
    self.label_4.setObjectName(_fromUtf8("label_4"))
    self.label_5 = QtGui.QLabel(self.centralwidget)
    self.label_5.setGeometry(QtCore.QRect(30, 190, 71, 21))
    self.label_5.setObjectName(_fromUtf8("label_5"))
    self.label_3 = QtGui.QLabel(self.centralwidget)
    self.label_3.setGeometry(QtCore.QRect(30, 280, 71, 21))
    self.label_3.setObjectName(_fromUtf8("label_3"))
    self.tx_comb = QtGui.QComboBox(self.centralwidget)
    self.tx_comb.setGeometry(QtCore.QRect(120, 190, 69, 22))
    self.tx_comb.setEditable(True)
    self.tx_comb.setObjectName(_fromUtf8("tx_comb"))
    self.tx_comb.addItem(_fromUtf8(""))
    self.tx_comb.setItemText(0, _fromUtf8(""))
    self.tx_comb.addItem(_fromUtf8(""))
    self.tx_comb.addItem(_fromUtf8(""))
    self.tx_comb.addItem(_fromUtf8(""))
    self.tx_comb.addItem(_fromUtf8(""))
    self.tx_comb.addItem(_fromUtf8(""))

    self.pushButton = QtGui.QPushButton(self.centralwidget)
    self.pushButton.setGeometry(QtCore.QRect(20, 450, 90, 23))
    self.pushButton.setObjectName(_fromUtf8("pushButton"))

    MainWindow.setCentralWidget(self.centralwidget)
    self.menubar = QtGui.QMenuBar(MainWindow)
    self.menubar.setGeometry(QtCore.QRect(0, 0, 544, 21))
    self.menubar.setObjectName(_fromUtf8("menubar"))
    MainWindow.setMenuBar(self.menubar)
    self.statusbar = QtGui.QStatusBar(MainWindow)
    self.statusbar.setObjectName(_fromUtf8("statusbar"))
    MainWindow.setStatusBar(self.statusbar)

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

def retranslateUi(self, MainWindow):
    MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow", None))
    self.lic_name_comb.setItemText(1, _translate("MainWindow", "Comms 1 ",   None))
    self.lic_name_comb.setItemText(2, _translate("MainWindow", "Comms 2",   None))
    self.lic_name_comb.setItemText(3, _translate("MainWindow", "Comms 3",   None))
    self.label.setText(_translate("MainWindow", "Licensee", None))
    self.label_2.setText(_translate("MainWindow", "License nr", None))
    self.lic_nr_comb.setItemText(1, _translate("MainWindow", "12345689",   None))
    self.lic_nr_comb.setItemText(2, _translate("MainWindow", "13634568",   None))
    self.lic_nr_comb.setItemText(3, _translate("MainWindow", "56345689",   None))
    self.label_8.setText(_translate("MainWindow", "System", None))

    self.sys_name_comb.setItemText(1, _translate("MainWindow", "Repeater ",   None))
    self.sys_name_comb.setItemText(2, _translate("MainWindow", "Telemetry", None))
    self.sys_name_comb.setItemText(3, _translate("MainWindow", "Trunking ",   None))
    self.sys_name_comb.setItemText(4, _translate("MainWindow", "Alarm",   None))
    self.sys_name_comb.setItemText(5, _translate("MainWindow", "Relay",   None))

    self.insp_date_comb.setDisplayFormat(_translate("MainWindow",   "d/M/yyyy", None))
    self.label_9.setText(_translate("MainWindow", "Inspection Date", None))
    self.submit_btn.setText(_translate("MainWindow", "Submit", None))
    self.Loc_comb.setItemText(1, _translate("MainWindow", "Location 1 ",   None))
    self.Loc_comb.setItemText(2, _translate("MainWindow", "Location 2 ",   None))

    self.label_10.setText(_translate("MainWindow", "Location", None))

    self.tolabel.setText(_translate("MainWindow", "OFFICER", None))

    self.rx_comb.setItemText(1, _translate("MainWindow", "100", None))
    self.rx_comb.setItemText(2, _translate("MainWindow", "200", None))
    self.rx_comb.setItemText(3, _translate("MainWindow", "300", None))
    self.rx_comb.setItemText(4, _translate("MainWindow", "400", None))
    self.rx_comb.setItemText(5, _translate("MainWindow", "500", None))
    self.label_6.setText(_translate("MainWindow", "RX FREQ", None))
    self.fwdpwr_comb.setItemText(1, _translate("MainWindow", "10", None))
    self.fwdpwr_comb.setItemText(2, _translate("MainWindow", "20", None))
    self.fwdpwr_comb.setItemText(3, _translate("MainWindow", "30", None))
    self.rflpwr_comb.setItemText(1, _translate("MainWindow", "1", None))
    self.rflpwr_comb.setItemText(2, _translate("MainWindow", "2", None))
    self.rflpwr_comb.setItemText(3, _translate("MainWindow", "3", None))
    self.rflpwr_comb.setItemText(4, _translate("MainWindow", "4", None))
    self.rflpwr_comb.setItemText(5, _translate("MainWindow", "5", None))
    self.label_4.setText(_translate("MainWindow", "REFL PWR", None))
    self.label_5.setText(_translate("MainWindow", "TX FREQ", None))
    self.label_3.setText(_translate("MainWindow", "FWD PWR ", None))
    self.tx_comb.setItemText(1, _translate("MainWindow", "100", None))
    self.tx_comb.setItemText(2, _translate("MainWindow", "200", None))
    self.tx_comb.setItemText(3, _translate("MainWindow", "300", None))
    self.tx_comb.setItemText(4, _translate("MainWindow", "400", None))
    self.tx_comb.setItemText(5, _translate("MainWindow", "500", None))

    self.pushButton.setText(_translate("MainWindow", "View Data ", None))

    self.pushButton.clicked.connect(self.ViewPage)



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

Answer 1

The problem is in your design, you should not think that each file is a different program, it is really only one.

Another recommendation is that you do not modify the code generated by QtDesigner, this is not necessary also if you want to modify something in the GUI will erase all the above, for example if you have a design for example the Login.py:

class Ui_Logged(object):
    def setupUi(self, MainWindow):
      [...]

Then you must create another class that implements the logic

class Login(QtGui.QMainWindow, Login.Ui_Logged):
    def __init__(self, *args, **kwargs):
        QtGui.QMainWindow.__init__(self, *args, **kwargs)
        self.setupUi(self)
        [...]

then in your case you have to Page1() member of the class and show it when you call WW() , you should not create it just open it

class Login(QtGui.QMainWindow, Login.Ui_Logged):
    def __init__(self, *args, **kwargs):
        QtGui.QMainWindow.__init__(self, *args, **kwargs)
        self.setupUi(self)
        self.Login_button.clicked(self.slot1)
        self.window = Page1()

    def WW(self):
        self.window.show()
        self.hide()

The same thing you have to do in Page1() with each slot. NextPage() is the class that implements the logic of Ui_NextPage()

class Page1(QtGui.QMainWindow, Page22.Ui_Page1)
    def __init__(self, *args, **kwargs):
        QtGui.QMainWindow.__init__(self, *args, **kwargs)
        self.setupUi(self)
        self.pushButton.clicked.connect(self.dataenter)
        self.pushButton_2.clicked.connect(self.dataview)
        self.pushButton_3.clicked.connect(self.Taview)
        self.pushButton_4.clicked.connect(self.exit)
        self.nextPage = NextPage()

    def dataenter(self):
        self.nextPage.show()  

        [...]

So if we have that logic it's easy to call to access the QComboBox from slot() :

def slot1(self):
    uName = self.user.text()
    uPass = self.password.text()
    combo = self.window.nextPage.tocomb
    items = [combo.itemText(i) for i in range(combo.count())]
    if uName not in items:
        combo.addItem(uName)
    combo.setCurrentTex(uName)

I have tried to order your code, maybe have import problems but I think they should be minimal so you can fix them, run the file main.py. The complete code can be found at the following link .