PyQt - Editor

import sys
from PyQt4 import QtGui, QtCore

class Editor(QtGui.QWidget):

    def __init__(self):
        super(Editor, self).__init__()
        self.initUI()

    def initUI(self):

        self.setGeometry(200, 100, 400, 300)
        self.setWindowTitle('Editor App')
        self.setWindowIcon(QtGui.QIcon('e.png'))

        self.editor = QtGui.QTextEdit(self)
        self.editor.setGeometry(10, 10, 380, 250)

        self.openFile = QtGui.QPushButton('Open', self)
        self.saveFile = QtGui.QPushButton('Save As Plain Text', self)
        self.saveHTML = QtGui.QPushButton('Save As HTML', self)
        self.pbExit = QtGui.QPushButton('Exit', self)

        self.openFile.setGeometry(10, 270, 70, 20)
        self.saveFile.setGeometry(85, 270, 120, 20)
        self.saveHTML.setGeometry(210, 270, 100, 20)
        self.pbExit.setGeometry(315, 270, 70, 20)

        self.connect( self.openFile, QtCore.SIGNAL('clicked()'), self.openPlease )
        self.connect( self.saveFile, QtCore.SIGNAL('clicked()'), self.savePlease )
        self.connect( self.saveHTML, QtCore.SIGNAL('clicked()'), self.saveHtmlPlease )
        self.connect( self.pbExit, QtCore.SIGNAL('clicked()'), QtGui.qApp, QtCore.SLOT('quit()'))

    def openPlease(self):
        filename = QtGui.QFileDialog.getOpenFileName(self, 'Open File', '.')
        fname = open(filename)
        data = fname.read()
        fname.close()
        self.editor.setText(data)

    def savePlease(self):
        filename = QtGui.QFileDialog.getSaveFileName(self, 'Save File', '.')
        fname = open(filename, 'w')
        fname.write(self.editor.toPlainText())
        fname.close()

    def saveHtmlPlease(self):
        filename = QtGui.QFileDialog.getSaveFileName(self, 'Save File', '.')
        fname = open(filename, 'w')
        fname.write(self.editor.toHtml())
        fname.close()


app = QtGui.QApplication(sys.argv)
file = Editor()
file.show()
sys.exit(app.exec_())

PyQt - Editor