python - Convert numeric value in module to its variable name -

in python 2.7, what's best / easiest / "pythonic" way convert integer value name of module-scoped constant value?

bonus points if there's way scope search variable names beginning magic prefix.

in other words:

evt_foo =0x0001 evt_bar =0x0002 evt_spam=0x0004 evt_eggs=0x0008  def getevtname( val ):     """ should return 'evt_foo' when given number 0x1 """     pass  

i know create dictionary reverse-lookup, i'd think there's better way in python. suggestions?

you can use globals() function name if global object :

>>> evt_foo =0x0001 >>> evt_bar =0x0002 >>> evt_spam=0x0004 >>> evt_eggs=0x0008 >>>  >>> def getevtname( val ): ...     return next((i i,j in globals().iteritems() if j==val , i.startswith(something)),none) ...  >>> getevtname(0x0001) 'evt_foo'