fixup in Validator does not replace value in lineEdit

class Param_validate_value(QtGui.QValidator):

    def __init__(self, r_min, r_max):
        super(Param_validate_value, self).__init__()
        self.min = r_min
        self.max = r_max
    
    def validate(self, entry, cursor_pos):
        return QtGui.QValidator.Intermediate
        
    def fixup(self, entry):
        print "22"
        return "22"