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#!/usr/bin/env python
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# Concatenates spreadsheet columns in the order provided.
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# The position and header of the combined column are that of the first column.
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import csv
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import sys
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def main():
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    try: _prog_name, col0_num, col1_num = sys.argv
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    except ValueError: raise SystemExit('Usage: '+sys.argv[0]
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        +' <in col0# col1# [| '+sys.argv[0]+' new_col0# new_col1#]... >out')
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    col0_num, col1_num = map(int, [col0_num, col1_num])
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    # Transform input
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    reader = csv.reader(sys.stdin)
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    writer = csv.writer(sys.stdout)
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    is_header = True
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    for row in reader:
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        if is_header: is_header = False # don't concatenate headers
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        else: row[col0_num] += row[col1_num]
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        del row[col1_num]
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        writer.writerow(row)
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main()
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