#输入对话框
def showDialog(self):

        text, ok = QInputDialog.getText(self, 'Input Dialog', 
            'Enter your name:')

        if ok:
            self.le.setText(str(text))

#选色对话框
def showDialog(self):

        col = QColorDialog.getColor()

        if col.isValid():
            self.frm.setStyleSheet("QWidget { background-color: %s }"
                % col.name())

#选字体对话框
def showDialog(self):

        font, ok = QFontDialog.getFont()
        if ok:
            self.lbl.setFont(font)

#选文件对话框
def showDialog(self):

        fname = QFileDialog.getOpenFileName(self, 'Open file', '/home')

        if fname[0]:
            f = open(fname[0], 'r')

            with f:
                data = f.read()
                self.textEdit.setText(data)