[issue38565] Expose the value passed of typed passed to functools.lru_cache

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

It is easy:

diff --git a/Lib/functools.py b/Lib/functools.py
index 3192bd02d9..52c07db749 100644
--- a/Lib/functools.py
+++ b/Lib/functools.py
@@ -499,7 +499,9 @@ def lru_cache(maxsize=128, typed=False):
         # The user_function was passed in directly via the maxsize argument
         user_function, maxsize = maxsize, 128
         wrapper = _lru_cache_wrapper(user_function, maxsize, typed, _CacheInfo)
-        return update_wrapper(wrapper, user_function)
+        func = update_wrapper(wrapper, user_function)
+        func.cache_parameters = lambda: {'maxsize': maxsize, 'typed': typed}
+        return func
     elif maxsize is not None:
         raise TypeError(
             'Expected first argument to be an integer, a callable, or None')

But there are many design questions. Why method instead of just attribute?

        func.cache_parameters = {'maxsize': maxsize, 'typed': typed}

Or maybe just add the "typed" attribute?

        func.typed = typed


Also I consider adding the more general "make_key" parameter to lru_cache(). The "typed" parameter would just specify the default value for "make_key".

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38565>
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