Finding open oflag Settings

In tracings you see the numerical value for flags like the oflag settings to the C open commands e.g.

    5901 open("/proc/asound/cards", 32768, 0666) = 7

to find out what they mean I just quickly did:

    In [36]: def oflag_to_string(oflag):
       ....:     for c in dir(os):
       ....:         if c.startswith('O_'):
       ....:             if eval('os.'+c) & oflag:
       ....:                 print c
       ....:
       ....:

    In [37]: oflag_to_string(32768)
    O_LARGEFILE

but afterwards realised I could have just done an strace since that nicely converts the values for you.