human
Solve the following python programming problem given the following code:
def _main(argv) : 
    'Simple program to read/write ChunkedFiles.' 
    parser = ArgumentParser () 
    parser.add_argument ('--read', action = 'store_const', const = 'r', dest = 'read', help = 'Read data from file') 
    parser.add_argument ('--seek', nargs = 1, type = int, help = 'Seek position before reading') 
    parser.add_argument ('--write', action = 'store_const', const = 'w', dest = 'mode', help = 'Write data to file') 
    parser.add_argument ('--append', action = 'store_const', const = 'a', dest = 'mode', help = 'Append data to file') 
    parser.add_argument ('file', nargs = 1, help = 'Container to read/write') 
    parser.add_argument ('subfile', nargs = '?', help = 'Subfile to read/write') 
    args = parser.parse_args (argv [1 :]) 
    def move_data(readfh, writefh) : 
        'Move data from readfh to writefh until EOF.' 
        while True : 
            buf = readfh.read ((1024 * 1024)) 
            if (not buf) : 
                break 
writefh.write (buf) 
if (args.mode and (args.mode in 'aw')) : 
        cfh = ChunkedFile (args.file [0], subfile = args.subfile, mode = args.mode) 
        move_data (sys.stdin, cfh) 
        cfh.close () 
if (args.read or (not args.mode)) : 
        cfh = ChunkedFile (args.file [0], subfile = cfh.subfile, mode = 'r') 
        if args.seek : 
            cfh.seek (args.seek [0]) 
move_data (cfh, sys.stdout) 
        cfh.close () 

    
    

    Fix the buggy line: cfh = ChunkedFile (args.file [0], subfile = cfh.subfile, mode = 'r')
assistant
#Here is Python program to fix the buggy line: cfh = ChunkedFile (args.

cfh = ChunkedFile (args.file [0], subfile = args.subfile, mode = 'r')