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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 example_transform(v, row, row_n, i_s, i_d, header_s, header_d,scratch, errors, accumulator):
 """ An example column transform. This is an example of a column transform with all of the arguments listed. An real transform can omit any ( or all ) of these, and can supply them in any order; the calling code will inspect the signature. When the function is listed as a transform for a column, it is called for every row of data. :param v: The current value of the column :param row: A RowProxy object for the whiole row. :param row_n: The current row number. :param i_s: The numeric index of the source column :param i_d: The numeric index for the destination column :param header_s: The name of the source column :param header_d: The name of the destination column :param scratch: A dict that can be used for storing any values. Persists between rows. :param errors: A dict used to store error messages. Persists for all columns in a row, but not between rows. :param accumulator: A dict for use in accumulating values, such as computing aggregates. :return: The final value to be supplied for the column. """


    return str(v)+'-foo'