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gh-131525: Remove _HashedSeq wrapper from lru_cache #131922

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Merged
merged 1 commit into from
Mar 31, 2025
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gh-131525: Remove _HashedSeq wrapper from lru_cache #131922

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18 changes: 1 addition & 17 deletions Lib/functools.py
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Original file line number Diff line number Diff line change
Expand Up @@ -516,22 +516,6 @@ def _unwrap_partialmethod(func):

_CacheInfo = namedtuple("CacheInfo", ["hits", "misses", "maxsize", "currsize"])

class _HashedSeq(list):
""" This class guarantees that hash() will be called no more than once
per element. This is important because the lru_cache() will hash
the key multiple times on a cache miss.

"""

__slots__ = 'hashvalue'

def __init__(self, tup, hash=hash):
self[:] = tup
self.hashvalue = hash(tup)

def __hash__(self):
return self.hashvalue

def _make_key(args, kwds, typed,
kwd_mark = (object(),),
fasttypes = {int, str},
Expand Down Expand Up @@ -561,7 +545,7 @@ def _make_key(args, kwds, typed,
key += tuple(type(v) for v in kwds.values())
elif len(key) == 1 and type(key[0]) in fasttypes:
return key[0]
return _HashedSeq(key)
return key

def lru_cache(maxsize=128, typed=False):
"""Least-recently-used cache decorator.
Expand Down
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