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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def onchange(self, new_value):
 """Called when the user changes the TextInput content. With single_line=True it fires in case of focus lost and Enter key pressed. With single_line=False it fires at each key released. Args: new_value (str):
 the new string content of the TextInput. """

        self.disable_refresh()
        self.set_value(new_value)
        self.enable_refresh()
        return (new_value, )