new_contents: #!/usr/bin/env python3.5
  
  import csv
  
  def read(f, cols):
    r = csv.reader(f)
    # r = csv.reader(f, delimiter='~')
    for row in r:
      print([row[col-1] for col in cols])
  
  if __name__ == '__main__':
    import sys
    args = sys.argv[1:]
    if (len(args) >= 1):
      cols = [int(val) for val in args]
      f = sys.stdin
      read(f, cols)
  
subject: Create csvreader.py