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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 new(self, version):
        # type: () -> None
        '''
        A method to create a new UDF NSR Volume Structure.

        Parameters:
         None.
        Returns:
         Nothing.
        '''
        if self._initialized:
            raise pycdlibexception.PyCdlibInternalError('UDF NSR Volume Structure already initialized')

        if version == 2:
            self.standard_ident = b'NSR02'
        elif version == 3:
            self.standard_ident = b'NSR03'
        else:
            raise pycdlibexception.PyCdlibInternalError('Invalid NSR version requested')

        self._initialized = True