Lasse Vågsæther Karlsen wrote:
> Sam Pointon wrote:
>
>> What about not storing args at all? Something like this:
<snip>
Ok, here's my updated version:
class cache(object):
def __init__(self, timeout=0):
self.timeout = timeout
self.cache = {}
def __call__(self, fn):
arg_names = inspect.getargspec(fn)[0]
def cached_result(*args, **kwargs):
# Update named arguments with positional argument values
kwargs.update(dict(zip(arg_names, args)))
# Work out key as a tuple of ('argname', value) pairs
key = tuple(sorted(kwargs.items()))
# Check cache and return cached value if possible
if key in self.cache:
(value, last_time) = self.cache[key]
if self.timeout <= 0 or time.time() - last_time <=
self.timeout:
return value
# Work out new value, cache it and return it
result = fn(**kwargs)
self.cache[key] = (result, time.time())
return result
# Return wrapper function
return cached_result
Changed from previous versions:
- converted to class, must use () on decorator now
- added timeout, results will be recalculated when it expires
- timeout=0 means no timeout, results will always be reused
- now handles both positional and keyword arguments
--
Lasse Vågsæther Karlsen
http://usinglvkblog.blogspot.com/
mailto:[EMAIL PROTECTED]
PGP KeyID: 0x2A42A1C2
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