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#!/usr/bin/env python
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# Translates a spreadsheet column using a dictionary.
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# The column header is also translated. CSVs without a header are supported.
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# Unrecognized names are left untouched, permitting successive runs on different
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# dictionaries.
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# Case- and punctuation-sensitive. (Use canon first for case-insensitivity.)
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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, col_num, dict_path = sys.argv
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    except ValueError: raise SystemExit('Usage: '+sys.argv[0]
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        +' <in col# dict [| '+sys.argv[0]+' col# dict_2]... >out')
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    col_num = int(col_num)
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    # Get dict
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    dict_ = {}
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    stream = open(dict_path, 'rb')
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    reader = csv.reader(stream)
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    for row in reader: dict_[row[0]] = row[1]
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    stream.close()
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    # Translate input
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    reader = csv.reader(sys.stdin)
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    writer = csv.writer(sys.stdout)
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    for row in reader:
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        term = row[col_num]
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        try: row[col_num] = dict_[term]
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        except KeyError: pass
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        writer.writerow(row)
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main()
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