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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 copy_raw_block(self):
        '''
        Copies the block as it was originally specified by start and end into a new table.

        Returns:
            A copy of the block with no block transformations.
        '''
        ctable = []
        r, c = 0, 0
        try:
            for row_index in range(self.start[0], self.end[0]):
                r = row_index
                row = []
                ctable.append(row)
                for column_index in range(self.start[1], self.end[1]):
                    c = column_index
                    row.append(self.table[row_index][column_index])
        except IndexError:
            raise InvalidBlockError('Missing table element at [%d, %d]' % (r, c))
        return ctable