python - String representation of file name -

I have a script that uses argparse to control command line arguments. An argument stdin or a filename can be the original code looks like this:

  import argype P = argparse.ArgumentParser () p.add_argument ('-' input, type = argparse.fileType ('R'), default = '-') args = p.parse_args () for line in args.input: print line   
 In the second section of the code, The string representation is required. How do I get a string named this file? I was trying this way, without success:  
  str (args.input) repr (args.input)    
 
 
 Use the file object:  
  args.input.name   
 This is the file name of the open filebiz, or   sys.stdin  for .