diff --git a/lib/backports/functools_lru_cache.py b/lib/backports/functools_lru_cache.py
index e0b19d95..8be4515f 100644
--- a/lib/backports/functools_lru_cache.py
+++ b/lib/backports/functools_lru_cache.py
@@ -4,7 +4,7 @@ import functools
 from collections import namedtuple
 from threading import RLock
 
-_CacheInfo = namedtuple("CacheInfo", ["hits", "misses", "maxsize", "currsize"])
+_CacheInfo = namedtuple("_CacheInfo", ["hits", "misses", "maxsize", "currsize"])
 
 
 @functools.wraps(functools.update_wrapper)
@@ -63,7 +63,7 @@ def _make_key(
     return _HashedSeq(key)
 
 
-def lru_cache(maxsize=100, typed=False):
+def lru_cache(maxsize=100, typed=False):  # noqa: C901
     """Least-recently-used cache decorator.
 
     If *maxsize* is set to None, the LRU features are disabled and the cache
@@ -136,7 +136,7 @@ def lru_cache(maxsize=100, typed=False):
                     if link is not None:
                         # record recent use of the key by moving it
                         # to the front of the list
-                        root, = nonlocal_root
+                        (root,) = nonlocal_root
                         link_prev, link_next, key, result = link
                         link_prev[NEXT] = link_next
                         link_next[PREV] = link_prev
@@ -148,7 +148,7 @@ def lru_cache(maxsize=100, typed=False):
                         return result
                 result = user_function(*args, **kwds)
                 with lock:
-                    root, = nonlocal_root
+                    (root,) = nonlocal_root
                     if key in cache:
                         # getting here means that this same key was added to the
                         # cache while the lock was released.  since the link