def onTextChange(self, text):
regExp = QRegExp()
regExp.setPattern("[^0-9]*")
m_correctText = ""
if regExp.exactMatch(text):
m_correctText = text
QToolTip.hideText()
else:
point = QPoint(self.l.geometry().left(),
self.l.geometry().bottom())
self.l.setText(m_correctText)
QToolTip.showText(point, "Cannot enter number..")
