#! /usr/bin/env python# Check that all ".pyc" files exist and are up-to-date# Uses module 'os' import sysimport osfrom stat import ST_MTIMEimport imp def main():    silent = 0    verbose = 0    if sys.argv[1:]:        if sys.argv[1] == '-v':            verbose = 1        elif sys.argv[1] == '-s':            silent = 1    MAGIC = imp.get_magic()    if not silent:        print 'Using MAGIC word', repr(MAGIC)    for dirname in sys.path:        try:            names = os.listdir(dirname)        except os.error:            print 'Cannot list directory', repr(dirname)            continue        if not silent:            print 'Checking ', repr(dirname), '...'        names.sort()        for name in names:            if name[-3:] == '.py':                name = os.path.join(dirname, name)                try:                    st = os.stat(name)                except os.error:                    print 'Cannot stat', repr(name)                    continue                if verbose:                    print 'Check', repr(name), '...'                name_c = name + 'c'                try:                    f = open(name_c, 'r')                except IOError:                    print 'Cannot open', repr(name_c)                    continue                magic_str = f.read(4)                mtime_str = f.read(4)                f.close()                if magic_str <> MAGIC:                    print 'Bad MAGIC word in ".pyc" file',                    print repr(name_c)                    continue                mtime = get_long(mtime_str)                if mtime == 0 or mtime == -1:                    print 'Bad ".pyc" file', repr(name_c)                elif mtime <> st[ST_MTIME]:                    print 'Out-of-date ".pyc" file',                    print repr(name_c) def get_long(s):    if len(s) <> 4:        return -1    return ord(s[0]) + (ord(s[1])<<8) + (ord(s[2])<<16) + (ord(s[3])<<24) if __name__ == '__main__':    main()