pyqt4生成key工具

部份代碼：：：

# -*- coding: utf-8 -*-"""Module implementing CreateKey."""from PyQt4.QtCore import pyqtSignaturefrom PyQt4.QtGui import QDialogfrom PyQt4 import QtGui,QtCorefrom Ui_CreateKey import Ui_CreateKeyimport base64,uuidclass CreateKey(QDialog, Ui_CreateKey):    """    Class documentation goes here.    """    def __init__(self, parent=None):        """        Constructor                @param parent reference to the parent widget (QWidget)        """        QDialog.__init__(self, parent)        self.clipboard = QtGui.QApplication.clipboard()        self.setupUi(self)        QtCore.QObject.connect(self.pushButton_3,QtCore.SIGNAL("clicked()"),self.clear)        QtCore.QObject.connect(self.pushButton_2,QtCore.SIGNAL("clicked()"),self.getkey)    @pyqtSignature("")    def on_pushButton_clicked(self):        key = base64.b64encode(uuid.uuid4().bytes + uuid.uuid4().bytes)        self.textBrowser.append(str(key))    @pyqtSignature("")    def clear(self):        self.textBrowser.clear()    @pyqtSignature("")    def getkey(self):       self.clipboard.setText(self.textBrowser.toPlainText().split('\n')[-1])if __name__ == "__main__":    import sys    app = QtGui.QApplication(sys.argv)    ui = CreateKey()    ui.show()    sys.exit(app.exec_())