title: pyqt4: AttributeError: 'QPlainTextEdit' object has no attribute 'text'
body: <p>I'm aware that there are similar problems to mine but I tried those solutions and they don't work.</p>
  
  <p>I have text field:</p>
  
  <pre><code>self.tMail = QtGui.QPlainTextEdit(self.centralwidget)
  self.tMail.setGeometry(QtCore.QRect(50, 270, 451, 75))
  self.tMail.setAccessibleName(_fromUtf8(""))
  self.tMail.setInputMethodHints(QtCore.Qt.ImhNone)
  self.tMail.setPlainText(_fromUtf8(""))
  self.tMail.setOverwriteMode(False)
  self.tMail.setObjectName(_fromUtf8("tMail"))
  </code></pre>
  
  <p>And i want to add them to the variable string by:</p>
  
  <pre><code>def handleButton(self):
      timeString = self.tCzas.text()
      mailString = self.tMail.text()
      IDString = self.tID.text()
      teamString = self.tTeam.text()
      print(timeString)
      print(mailString)
      print(IDString)
      print(teamString)`
  </code></pre>
  
  <p>also I tried:</p>
  
  <p><code>mailString = self.tMail.plainText()</code></p>
  
  <p>and I always get an error:
  <code>AttributeError: 'QPlainTextEdit' object has no attribute '...'</code></p>
  
  <p>Why?</p>