AttributeError: 'Ui_Login' -Objekt hat kein Attribut 'GetTable'

Question

Im Erstellen einer Login-und Anmeldeseite, die mit anderen GUI mit PyQt verbindet. Der Großteil des Codes funktioniert, aber wenn ich versuche, einen neuen Benutzer anzumelden, gibt es mir eine AttributeError: 'Ui_Login' Objekt hat kein Attribut 'GetTable'. GetTable ist im Code für die mit MySQl erstellte Datenbank definiert, die in die Klassen Login und Signup aufgerufen wird. Bitte neu in Python und Programmierung im Allgemeinen. Entschuldigung, wenn diese Frage doof erscheint. aber ich habe viel gelesen auf zuvor gestellte und ich kann nicht verstehen, was es sagt. Dank

# -*- coding: utf-8 -*- 

# Form implementation generated from reading ui file 'Login.ui' 
# 
# Created by: PyQt4 UI code generator 4.11.4 
# 
# WARNING! All changes made in this file will be lost! 
import sys 
import DBmanager as db 
from PyQt4 import QtCore, QtGui 
from newuser import Ui_Form 
from createprofile import Ui_StudentLogin 

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) 

#######SIGN IN/ LOG IN################################################################################################# 

class Ui_Login(QtGui.QWidget): 
    def __init__(self): 
     QtGui.QWidget.__init__(self) 
     self.dbu = db.DatabaseUtility('UsernamePassword_DB', 'masterTable') 
     self.setupUi(self) 
     self.confirm = None 

    def setupUi(self, Login): 
     Login.setObjectName(_fromUtf8("Form")) 
     Login.resize(400, 301) 
     self.label = QtGui.QLabel(Login) 
     self.label.setGeometry(QtCore.QRect(60, 60, 71, 21)) 
     font = QtGui.QFont() 
     font.setBold(True) 
     font.setWeight(75) 
     self.label.setFont(font) 
     self.label.setObjectName(_fromUtf8("label")) 
     self.label_2 = QtGui.QLabel(Login) 
     self.label_2.setGeometry(QtCore.QRect(60, 120, 81, 21)) 
     font = QtGui.QFont() 
     font.setBold(True) 
     font.setWeight(75) 
     self.label_2.setFont(font) 
     self.label_2.setObjectName(_fromUtf8("label_2")) 
     self.userName = QtGui.QLineEdit(Login) 
     self.userName.setGeometry(QtCore.QRect(140, 60, 151, 21)) 
     self.userName.setObjectName(_fromUtf8("userName")) 

     self.passWord = QtGui.QLineEdit(Login) 
     self.passWord.setGeometry(QtCore.QRect(140, 120, 151, 21)) 
     self.passWord.setObjectName(_fromUtf8("passWord")) 

     self.label_3 = QtGui.QLabel(Login) 
     self.label_3.setGeometry(QtCore.QRect(160, 10, 131, 21)) 
     font = QtGui.QFont() 
     font.setPointSize(10) 
     font.setBold(True) 
     font.setWeight(75) 
     self.label_3.setFont(font) 
     self.label_3.setObjectName(_fromUtf8("label_3")) 

     self.loginButton1 = QtGui.QPushButton(Login) 
     self.loginButton1.setGeometry(QtCore.QRect(40, 210, 75, 23)) 
     font = QtGui.QFont() 
     font.setBold(True) 
     font.setWeight(75) 
     self.loginButton1.setFont(font) 
     self.loginButton1.setObjectName(_fromUtf8("loginButton1")) 
     self.loginButton1.clicked.connect(self.login_Button1) 

     self.signUpButton = QtGui.QPushButton(Login) 
     self.signUpButton.setGeometry(QtCore.QRect(160, 210, 75, 23)) 
     font = QtGui.QFont() 
     font.setBold(True) 
     font.setWeight(75) 
     self.signUpButton.setFont(font) 
     self.signUpButton.setObjectName(_fromUtf8("signUpButton")) 
     self.signUpButton.clicked.connect(self.signUp_Button) 

     self.cancel1 = QtGui.QPushButton(Login) 
     self.cancel1.setGeometry(QtCore.QRect(280, 210, 75, 23)) 
     font = QtGui.QFont() 
     font.setBold(True) 
     font.setWeight(75) 
     self.cancel1.setFont(font) 
     self.cancel1.setObjectName(_fromUtf8("cancel1")) 
     self.connect(self, QtCore.SIGNAL('triggered()'), self.cancel_1) 

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

    def retranslateUi(self, Login): 
     Login.setWindowTitle(_translate("Form", "Login", None)) 
     self.label.setText(_translate("Form", "USERNAME", None)) 
     self.label_2.setText(_translate("Form", "PASSWORD", None)) 
     self.label_3.setText(_translate("Form", "LOGIN PAGE", None)) 
     self.loginButton1.setText(_translate("Form", "LOGIN", None)) 
     self.signUpButton.setText(_translate("Form", "SIGN UP", None)) 
     self.cancel1.setText(_translate("Form", "CANCEL", None)) 

    @QtCore.pyqtSignature("on_cancel1_clicked()") 
    def cancel_1(self): 
     self.close() 

    @QtCore.pyqtSignature("on_loginButton1_clicked()") 
    def login_Button1(self): 
     username = self.userName.text() 
     password = self.passWord.text() 
     if not username: 
      QtGui.QMessageBox.warning(self, 'Guess What?', 'Username Missing!') 
     elif not password: 
      QtGui.QMessageBox.warning(self, 'Guess What?', 'Password Missing!') 
     else: 
      self.AttemptLogin(username, password) 

    def AttemptLogin(self, username, password): 
     t = self.dbu.GetTable() 
     print (t) 
     for col in t: 
      if username == col[1]: 
       if password == col[2]: 
        QtGui.QMessageBox.information(self, 'WELCOME', 'Success!!') 
        self.createProfilePage() 
        self.close() 
       else: 
        QtGui.QMessageBox.warning(self, 'OOPS SORRY!', 'Password incorrect...') 
       return 


    def createProfilePage(self): 
     self.createprofile = Ui_StudentLogin() 
     self.createprofile.show() 


    @QtCore.pyqtSignature("on_signUpButton_clicked()") 
    def signUp_Button(self): 
     self.newuser = Ui_Form(self) 
     self.newuser.show() 

#######SIGN UP/ CREATE NEW USER################################################################################################# 


class Ui_Form(QtGui.QWidget): 
    def __init__(self,dbu): 
     QtGui.QWidget.__init__(self) 
     self.setupUi(self) 
     self.dbu = dbu 

    def setupUi(self, Form): 
     Form.setObjectName(_fromUtf8("Form")) 
     Form.resize(400, 300) 

     self.label = QtGui.QLabel(Form) 
     self.label.setGeometry(QtCore.QRect(60, 70, 51, 16)) 
     font = QtGui.QFont() 
     font.setBold(True) 
     font.setWeight(75) 
     self.label.setFont(font) 
     self.label.setObjectName(_fromUtf8("label")) 

     self.nameGet = QtGui.QLineEdit(Form) 
     self.nameGet.setGeometry(QtCore.QRect(120, 70, 191, 21)) 
     self.nameGet.setObjectName(_fromUtf8("nameGet")) 

     self.label_2 = QtGui.QLabel(Form) 
     self.label_2.setGeometry(QtCore.QRect(50, 120, 46, 13)) 
     font = QtGui.QFont() 
     font.setBold(True) 
     font.setWeight(75) 
     self.label_2.setFont(font) 
     self.label_2.setObjectName(_fromUtf8("label_2")) 

     self.label_3 = QtGui.QLabel(Form) 
     self.label_3.setGeometry(QtCore.QRect(30, 170, 71, 16)) 
     font = QtGui.QFont() 
     font.setBold(True) 
     font.setWeight(75) 
     self.label_3.setFont(font) 
     self.label_3.setObjectName(_fromUtf8("label_3")) 

     self.regNoGet = QtGui.QLineEdit(Form) 
     self.regNoGet.setGeometry(QtCore.QRect(120, 120, 191, 21)) 
     self.regNoGet.setObjectName(_fromUtf8("regNoGet")) 

     self.passWordGet = QtGui.QLineEdit(Form) 
     self.passWordGet.setGeometry(QtCore.QRect(120, 170, 191, 21)) 
     self.passWordGet.setObjectName(_fromUtf8("passWordGet")) 

     self.label_4 = QtGui.QLabel(Form) 
     self.label_4.setGeometry(QtCore.QRect(100, 20, 181, 21)) 
     font = QtGui.QFont() 
     font.setPointSize(10) 
     font.setBold(True) 
     font.setWeight(75) 
     self.label_4.setFont(font) 
     self.label_4.setObjectName(_fromUtf8("label_4")) 

     self.nextButton = QtGui.QPushButton(Form) 
     self.nextButton.setGeometry(QtCore.QRect(140, 250, 75, 23)) 
     font = QtGui.QFont() 
     font.setBold(True) 
     font.setWeight(75) 
     self.nextButton.setFont(font) 
     self.nextButton.setObjectName(_fromUtf8("nextButton")) 
     self.nextButton.clicked.connect(self.next_Button) 


     self.cancelButton = QtGui.QPushButton(Form) 
     self.cancelButton.setGeometry(QtCore.QRect(260, 250, 75, 23)) 
     font = QtGui.QFont() 
     font.setBold(True) 
     font.setWeight(75) 
     self.cancelButton.setFont(font) 
     self.cancelButton.setObjectName(_fromUtf8("cancelButton")) 
     self.cancelButton.clicked.connect(self.cancel_Button) 

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

    def retranslateUi(self, Form): 
     Form.setWindowTitle(_translate("Form", "New User", None)) 
     self.label.setText(_translate("Form", "NAME", None)) 
     self.label_2.setText(_translate("Form", "REG. NO", None)) 
     self.label_3.setText(_translate("Form", "PASSWORD", None)) 
     self.label_4.setText(_translate("Form", "   CREATE NEW USER", None)) 
     self.nextButton.setText(_translate("Form", "SUBMIT", None)) 
     self.cancelButton.setText(_translate("Form", "CANCEL", None)) 

    @QtCore.pyqtSignature("on_cancelButton_clicked()") 
    def cancel_Button(self): 
     self.close() 


    @QtCore.pyqtSignature("on_nextButton_clicked()") 
    def next_Button(self): 
     username = self.nameGet.text() 
     password = self.passWordGet.text() 
     regno = self.regNoGet.text() 
     if not username: 
      QtGui.QMessageBox.warning(self, 'Warning', 'Username Missing') 
     elif not password: 
      QtGui.QMessageBox.warning(self, 'Warning!', 'Password Missing') 
     elif not regno: 
      QtGui.QMessageBox.warning(self, 'Warning!', 'RegNo Missing') 
     else: 
      t = self.dbu.GetTable() 
      print (t) 
      for col in t: 
       if username == col[1]: 
        QtGui.QMessageBox.warning(self, 'Dang it!', 'Username Taken. :(') 
      else: 
       self.dbu.AddEntryToTable (username, password, regno) 
       QtGui.QMessageBox.information(self, 'Awesome!!', 'User Added SUCCESSFULLY!') 
       self.close() 



## def createProfileWindow(self): 
##  self.createprofile = Ui_StudentLogin() 
##  self.createprofile.show() 
## 
## def generate_report(self): 
##  data_line1 = self.nameGet.displayText() 
##  data_line2 = self.regNoGet.displayText() 
##  data_line3 = self.passWordGet.displayText() 
##  print data_line1 
##  print data_line2 
##  print data_line3 
##   




if __name__ == '__main__': 
    app = QtGui.QApplication(sys.argv) 
    ex = Ui_Login() 
    ex.show() 
    sys.exit(app.exec_()) 

Answer 1

Das Problem scheint in Ihrer Initialisierung der Ui_Form zu sein. In diesem Snippet

@QtCore.pyqtSignature("on_signUpButton_clicked()") 
def signUp_Button(self): 
    self.newuser = Ui_Form(self) 
    self.newuser.show() 

es sieht aus wie Sie self sind vorbei, in diesem Fall eine Instanz der Klasse Ui_Login, wie der DBU an den Konstruktor der `Ui_Form‘ Klasse. Stattdessen solltest du den dbu wie so passieren.

@QtCore.pyqtSignature("on_signUpButton_clicked()") 
    def signUp_Button(self): 
     self.newuser = Ui_Form(self.dbu) 
     self.newuser.show() 

Sie werden eine Menge von Code zu finden, wie dieses Schlüsselwort Argumente in Konstrukteuren nicht rufen, aber ich finde es bei der Aufrechterhaltung einer lesbaren Code-Basis schlechte Praxis sein. Ich würde Ihnen daher raten, in Zukunft so etwas zu tun, um Verwirrung zu vermeiden.

self.newuser = Ui_Form(dbu=self.dbu) 

Answer 2

Ihr Code erwartet Sie diese Zeile:

db.DatabaseUtility('UsernamePassword_DB', 'masterTable') 

ein Objekt mit einer GetTable Methode zurückzukehren (und weist das Objekt zu self.dbu). Deshalb, wenn Sie anrufen self.dbu.GetTable() Sie eine Fehlermeldung erhalten, wenn alles, was von zurückgegeben wurde:

db.DatabaseUtility('UsernamePassword_DB', 'masterTable') 

nicht über diese Methode. So überprüfen, was:

db.DatabaseUtility('UsernamePassword_DB', 'masterTable') 

tatsächlich zurückgibt und den Code entsprechend anpassen.