#! /usr/bin/env python "Replace tabs with spaces in argument files.  Print names of changed files." import osimport sysimport getopt def main():    tabsize = 8    try:        opts, args = getopt.getopt(sys.argv[1:], "t:")        if not args:            raise getopt.error, "At least one file argument required"    except getopt.error, msg:        print msg        print "usage:", sys.argv[0], "[-t tabwidth] file ..."        return    for optname, optvalue in opts:        if optname == '-t':            tabsize = int(optvalue)     for filename in args:        process(filename, tabsize) def process(filename, tabsize):    try:        f = open(filename)        text = f.read()        f.close()    except IOError, msg:        print "%r: I/O error: %s" % (filename, msg)        return    newtext = text.expandtabs(tabsize)    if newtext == text:        return    backup = filename + "~"    try:        os.unlink(backup)    except os.error:        pass    try:        os.rename(filename, backup)    except os.error:        pass    f = open(filename, "w")    f.write(newtext)    f.close()    print filename if __name__ == '__main__':    main()