Basic Python GUI framework

Python_GUI.py

import os
import sys 
from PyQt4.QtCore import * 
from PyQt4.QtGui import * 
import base64
 
def main(): 
    app = QApplication(sys.argv) 
    w = MyWindow() 
    w.show() 
    sys.exit(app.exec_()) 

 
class MyWindow(QWidget): 
    def __init__(self, *args): 
        QWidget.__init__(self, *args) 
        self.setWindowTitle("@BBaskin Decoders")
 
        # create objects
        HelpMsg = QLabel(self.tr("Enter text to decode"))
        OutputTitle = QLabel(self.tr("Output"))
        ErrorTitle = QLabel(self.tr("Errors"))
        self.textInput = QLineEdit()
        self.outputWindow = QTextEdit()
        self.errorWindow = QTextEdit()        
        Base64Btn = QPushButton("Base64 Decode", self)
        ReverseBtn = QPushButton("String Reverse", self)
        ClearBtn = QPushButton("Clear", self)

        
        # layout
        layout = QVBoxLayout(self)
        layout.addWidget(HelpMsg)
        layout.addWidget(self.textInput)
        layout.addWidget(Base64Btn)
        layout.addWidget(ReverseBtn)
        layout.addWidget(ClearBtn)
        #layout.addWidget(quitBtn)
        

        layout.addWidget(OutputTitle)
        layout.addWidget(self.outputWindow)
        layout.addWidget(ErrorTitle)
        layout.addWidget(self.errorWindow)
        Base64Btn.clicked.connect(self.Base64decode)
        ReverseBtn.clicked.connect(self.Reversedecode)
        ClearBtn.clicked.connect(self.ClearOutput)

        self.setGeometry(300,300,280,170)
        self.setLayout(layout) 

        self.connect(self.textInput, SIGNAL("returnPressed(void)"),
                     self.Reversedecode)


    def ClearOutput(self):
        self.outputWindow.clear()
        self.errorWindow.clear()

            
    def Base64decode(self):
        self.outputWindow.clear()
        self.errorWindow.clear()
        text = str(self.textInput.text())
        try:
            decoded = base64.b64decode(text)
            self.outputWindow.setText(decoded)
        except TypeError:
            decoded = text + " Bad"
            self.errorWindow.setText(decoded)

    def Reversedecode(self):
        self.outputWindow.clear()
        self.errorWindow.clear()
        text = str(self.textInput.text())
        reversetext = text[::-1]
        self.outputWindow.setText(reversetext)
        
        
  
if __name__ == "__main__": 
    main()