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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 GetValue(self):
    '''
    Positionals have no associated options_string,
    so only the supplied arguments are returned.
    The order is assumed to be the same as the order
    of declaration in the client code

    Returns
      "argument_value"
    '''
    self.AssertInitialization('Positional')
    if str(self._widget.GetValue()) == EMPTY:
      return None
    return self._widget.GetValue()