New submission from Marek Otahal:
I'd like to use @lru_cache in a library. The problem is I can't know the
optimal values for 'maxsize', I need to set them at runtime.
I came with 2 possibilities:
1/ set cache's size from a hardcoded argument of the decorated method:
@lru_cache
def foo_long(self, arg1, ..., **kwds):
pass
# use
foo_long('hi', cacheSize = 1000)
This approach allows the users to customize cache size for their problem.
2/ from function's **kwds retrieve a name (string) of an instance member of the
class which will hold the cache's size value. This is not as clean as 1/, but
offers greated functionality for the use in a library sw: we can compute
desired cache size from internal values of the unstance, and the use of cache
can be totally transparent to the end user:
@lru_cache
def foo_long(self, arg1, .. , **kwds)
#use
foo_long('hi', cacheSizeRef='_cacheSize')
What do you think about the proposal?
best regards, Mark
----------
messages: 249406
nosy: Marek Otahal
priority: normal
severity: normal
status: open
title: functools.lru_cache: a way to set decorator arguments at runtime
type: enhancement
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue24969>
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