gistfile1.py

# this code:

import argparse

parser = argparse.ArgumentParser(prog='cat.py')
parser.add_argument('file', help='file to print and catenate')

main():
  args = parser.parse_args()
  file = open(args.file, 'r').read()
  print file

if __name__ == '__main__':
  main()

# gives me this error: 
# $ ./cat.py                                                                     
#   File "./cat.py", line 14
#     main():
#           ^
# SyntaxError: invalid syntax