title: Pyqt - Combobox, how to return selected text
body: <p>I need help with a program. This is a part from my hole program and i need help with my combobox, i have a combobox ADV, the data of this combo is from my db...
  I need get the selected item on combobox and pass it as a variable, because after i will create a tablewidget and insert the content of the db using the name as a parameter to take the "things" from my tables... example: i choose "rororo" in this combo.. so its selected.. then pass it as a variable and search about this variable in my db. i know how to do the search, but i dont know how to pass it as a variable.. i have the variable in my "pass_t" def.. but i want to return it to my setupUI def to do my search..</p>
  
  <pre><code>from PyQt4.QtGui import * 
  from PyQt4.QtSql import * 
  from PyQt4.QtCore import * 
  import sys
  
  try:
    _fromUtf8 = QString.fromUtf8
  except AttributeError:
    _fromUtf8 = lambda s: s
  
  class Ui_MainWindow(object):
  
    def setupUi(self, MainWindow):
        MainWindow.setObjectName(_fromUtf8("MainWindow"))
        MainWindow.resize(800, 600)
        self.centralwidget = QWidget(MainWindow)
        self.centralwidget.setObjectName(_fromUtf8("centralwidget"))
        self.comboADV = QComboBox(self.centralwidget)
        self.comboADV.setGeometry(QRect(110, 80, 91, 31))
        self.comboADV.setObjectName(_fromUtf8("comboADV"))
        self.comboADV.addItem(_fromUtf8(""))
        db = QSqlDatabase.addDatabase("QMYSQL")
        db.setHostName('localhost')
        db.setDatabaseName('database')
        db.setUserName('username')
        db.setPassword('password')
        if (db.open()==False):     
  
          QMessageBox.critical(None, "Database Error",
              db.lastError().text())   
        query  = QSqlQuery ("SELECT Palavra FROM Tabela053 WHERE Categoria='Adv.' ORDER BY Palavra ASC;")
        index=0
        while (query.next()):
        self.comboADV.addItem(query.value(0).toString())
        index = index+1
        self.comboADV.activated.connect(self.passtt) #want to change this
  #---------------------------------------important
    def passtt(self):
        a = self.comboADV.currentText()
        print a #here i can print the selected content of my comboADV
  if __name__ == "__main__":
    import sys
  
    app = QApplication(sys.argv)
    MainWindow = QMainWindow()
  
    ui = Ui_MainWindow()
    ui.setupUi(MainWindow)
  
  MainWindow.show()
  sys.exit(app.exec_())
  </code></pre>