Unexpected Python Behavior

[Andrew Dalke]

Fernando Perez wrote:
> Sorry to pitch in late, and forgive me if this has already been discussed and
> thrown out for some other reason, I didn't follow the whole thread.  Why not
> use function attributes for the cache?
> 
> In [3]: def foo(x):
>    ...:     if x in foo.cache:
>    ...:         print 'x=',x,'in cache!'
>    ...:     else:
>    ...:         print 'new calculation for x:',x
>    ...:         foo.cache[x] = 1
>    ...:
> 
> In [4]: foo.cache={}

It was discussed.  Here's Alex's comments

] def f(x):
]     if x in f.cache: ...
] f.cache = []
]
] which among other things suffers from f.cache having to be
] used in spots that come lexically before it's defined; or
] a decorator equivalent:

				Andrew
				dalke at dalkescientific.com