From b73457f007bd149a0f1009f58cbb3536ab9e0aac Mon Sep 17 00:00:00 2001
From: correctmost <134317971+correctmost@users.noreply.github.com>
Date: Sat, 11 May 2024 18:00:02 -0400
Subject: [PATCH] Cache _has_init calls to avoid repeated stats

_has_init can end up checking for the presence of the same files
over and over.

For example, when running pylint's import-error checks on a
codebase like yt-dlp, ~43,000 redundant stats were performed prior
to caching.

Closes pylint-dev/pylint#9613.
---
 astroid/manager.py  | 2 ++
 astroid/modutils.py | 1 +
 2 files changed, 3 insertions(+)

diff --git a/astroid/manager.py b/astroid/manager.py
index fc30bf9e2f..22ceec3c29 100644
--- a/astroid/manager.py
+++ b/astroid/manager.py
@@ -23,6 +23,7 @@
 from astroid.modutils import (
     NoSourceFile,
     _cache_normalize_path_,
+    _has_init,
     file_info_from_modpath,
     get_source_file,
     is_module_name_part_of_extension_package_whitelist,
@@ -457,6 +458,7 @@ def clear_cache(self) -> None:
         for lru_cache in (
             LookupMixIn.lookup,
             _cache_normalize_path_,
+            _has_init,
             util.is_namespace,
             ObjectModel.attributes,
             ClassDef._metaclass_lookup_attribute,
diff --git a/astroid/modutils.py b/astroid/modutils.py
index 6f67d1ab9a..971e1b7297 100644
--- a/astroid/modutils.py
+++ b/astroid/modutils.py
@@ -666,6 +666,7 @@ def _is_python_file(filename: str) -> bool:
     return filename.endswith((".py", ".pyi", ".so", ".pyd", ".pyw"))
 
 
+@lru_cache(maxsize=1024)
 def _has_init(directory: str) -> str | None:
     """If the given directory has a valid __init__ file, return its path,
     else return None.