# 获取Qt的剪切板并绑定回调函数
self.clipboard = QApplication.clipboard()
self.clipboard.dataChanged.connect(self.on_clipboard_changed)

 # 回调函数
 def on_clipboard_changed(self):
 data = self.clipboard.mimeData()
 if data.hasText():
  word = data.text().strip()
  m = re.match(r'[a-zA-Z]+', word)
  if m:
  self.setWord(word)
  #self.setWindowFlags(self.windowFlags() & QtCore.Qt.WindowStaysOnTopHint)
  #self.setWindowState(self.windowState() & ~QtCore.Qt.WindowMinimized | QtCore.Qt.WindowActive)
  trans = queryWords(word)
  self.setTrans(trans)
  
  ''' tip the window content has changed, but cannot move the window to the forground'''
  self.activateWindow()
  
  else:
  print(word)

def queryWords(word):
 ''' 利用有道翻译查询单词 '''
 url = 'http://dict.youdao.com/w/{}/'.format(word)
 html = getURL(url)
 soup = BeautifulSoup(html.text, 'html.parser')
 trans_container = soup.find(class_='trans-container')
 
 if not trans_container:
 ''' not found the translation '''
 return [word]
 
 trans_li = trans_container.find_all('li')
 trans_data = [li.text.strip() for li in trans_li]
 return trans_data