[PyQt4] check if value of QLabel changed

[ja.heller]

I Need to check if the value (str) of a qlabel changed.
I think about using the following code (nearly the same as used by a spinbox widget in PyQt):

self.connect(self.ui.labelEntry, QtCore.SIGNAL("valueChanged(str)"), self.autovalidate)

self.connect(self.ui.labelEntry, QtCore.SIGNAL("valueChanged(str)"), self.autovalidate)

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What's the correct Methode to check if value changed?

All the best;