#! /usr/bin/env python """Python utility to print MD5 checksums of argument files."""  bufsize = 8096fnfilter = Nonermode = 'rb' usage = """usage: sum5 [-b] [-t] [-l] [-s bufsize] [file ...]-b        : read files in binary mode (default)-t        : read files in text mode (you almost certainly don't want this!)-l        : print last pathname component only-s bufsize: read buffer size (default %d)file ...  : files to sum; '-' or no files means stdin""" % bufsize import sysimport osimport getoptimport md5 def sum(*files):    sts = 0    if files and isinstance(files[-1], file):        out, files = files[-1], files[:-1]    else:        out = sys.stdout    if len(files) == 1 and not isinstance(files[0], str):        files = files[0]    for f in files:        if isinstance(f, str):            if f == '-':                sts = printsumfp(sys.stdin, '<stdin>', out) or sts            else:                sts = printsum(f, out) or sts        else:            sts = sum(f, out) or sts    return sts def printsum(filename, out=sys.stdout):    try:        fp = open(filename, rmode)    except IOError, msg:        sys.stderr.write('%s: Can\'t open: %s\n' % (filename, msg))        return 1    if fnfilter:        filename = fnfilter(filename)    sts = printsumfp(fp, filename, out)    fp.close()    return sts def printsumfp(fp, filename, out=sys.stdout):    m = md5.new()    try:        while 1:            data = fp.read(bufsize)            if not data:                break            m.update(data)    except IOError, msg:        sys.stderr.write('%s: I/O error: %s\n' % (filename, msg))        return 1    out.write('%s %s\n' % (m.hexdigest(), filename))    return 0 def main(args = sys.argv[1:], out=sys.stdout):    global fnfilter, rmode, bufsize    try:        opts, args = getopt.getopt(args, 'blts:')    except getopt.error, msg:        sys.stderr.write('%s: %s\n%s' % (sys.argv[0], msg, usage))        return 2    for o, a in opts:        if o == '-l':            fnfilter = os.path.basename        elif o == '-b':            rmode = 'rb'        elif o == '-t':            rmode = 'r'        elif o == '-s':            bufsize = int(a)    if not args:        args = ['-']    return sum(args, out) if __name__ == '__main__' or __name__ == sys.argv[0]:    sys.exit(main(sys.argv[1:], sys.stdout))