sort_csv_by_fields.py

import csv,sys

def fn_sort_by(key, header_index):
  return lambda x,y:cmp(x[header_index[key]], y[header_index[key]])

if __name__ == "__main__":
  csvfilename = sys.argv[1]
  sort_fileds = sys.argv[2]
  f = open(csvfilename)
  header = f.readline().split(',')
  header_index = dict(zip(header, range(len(header))))
  csvfile = list(csv.reader(f))
  for field in sort_fields.split(","):
    csvfile.sort(fn_sort_by(field, header_index))