regarding memoize function

[ankitks.mital@gmail.com]

I saw example of memoize function...here is snippet

def memoize(fn, slot):
def memoized_fn(obj , *args):
if hasattr(obj, slot):
return getattr(obj, slot)
else:
val = fn(obj, *args)
setattr(obj, slot, val)
return val
return memoized_fn


and I am really clueless, about what it does. I know in general we try
to keep computed values for future usage. But I am having hard-time
visualizing it.
What is obj here? and what does *args means?
Thanks

[Dan Bishop]

Re: regarding memoize function

On Apr 3, 6:33 pm, ankitks.mi...@g mail.com wrote:

I saw example of memoize function...here is snippet
>
def memoize(fn, slot):
def memoized_fn(obj , *args):
if hasattr(obj, slot):
return getattr(obj, slot)
else:
val = fn(obj, *args)
setattr(obj, slot, val)
return val
return memoized_fn
>
and I am really clueless, about what it does. I know in general we try
to keep computed values for future usage. But I am having hard-time
visualizing it.
What is obj here? and what does *args means?

*args is Python's syntax for variadic functions.

[Gabriel Genellina]

Re: regarding memoize function

En Thu, 03 Apr 2008 21:21:11 -0300, Dan Bishop <danb_83@yahoo. com>
escribió:

On Apr 3, 6:33 pm, ankitks.mi...@g mail.com wrote:

>I saw example of memoize function...here is snippet
>>
>def memoize(fn, slot):
> def memoized_fn(obj , *args):
> if hasattr(obj, slot):
> return getattr(obj, slot)
> else:
> val = fn(obj, *args)
> setattr(obj, slot, val)
> return val
> return memoized_fn
>>
>and I am really clueless, about what it does. I know in general we try
>to keep computed values for future usage. But I am having hard-time
>visualizing it.
>What is obj here? and what does *args means?

>
*args is Python's syntax for variadic functions.

In case the strange name gives you nothing, see section 4.7 in the
Tutorial [1]
For a much simpler implementation, see this FAQ entry [2]

[1] http://docs.python.org/tut/node6.htm...00000000000000
[2]

http://www.python.org/doc/faq/general/#why-are-default-values-shared-between-objects

--
Gabriel Genellina