From 193921024e3aaf9568169564e366575fd0bdf785 Mon Sep 17 00:00:00 2001
From: Sebastian Rittau <srittau@rittau.biz>
Date: Thu, 30 Sep 2021 19:09:57 +0200
Subject: [PATCH] Add SimpleSequence as preferred alias for
 SupportsLenAndGetItem

This protocol represents a sequence as defined in the Python
documentation, as opposed to collections.abc.Sequence.
---
 stdlib/_typeshed/__init__.pyi | 9 +++++++++
 stdlib/builtins.pyi           | 4 ++--
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/stdlib/_typeshed/__init__.pyi b/stdlib/_typeshed/__init__.pyi
index 9e60fd07e017..0bf46b47934b 100644
--- a/stdlib/_typeshed/__init__.pyi
+++ b/stdlib/_typeshed/__init__.pyi
@@ -46,6 +46,15 @@ class SupportsDivMod(Protocol[_T_contra, _T_co]):
 class SupportsRDivMod(Protocol[_T_contra, _T_co]):
     def __rdivmod__(self, __other: _T_contra) -> _T_co: ...
 
+# This represents a sequence as defined in the Python documentation:
+# https://docs.python.org/3/glossary.html#term-sequence
+# collections.abc.Sequence and typing.Sequence are not protocols and
+# have additional fields that are often unnecessary.
+class SimpleSequence(Protocol[_T_co]):
+    def __len__(self) -> int: ...
+    def __getitem__(self, __k: int) -> _T_co: ...
+
+# obsolete, use SimpleSequence instead
 class SupportsLenAndGetItem(Protocol[_T_co]):
     def __len__(self) -> int: ...
     def __getitem__(self, __k: int) -> _T_co: ...
diff --git a/stdlib/builtins.pyi b/stdlib/builtins.pyi
index fe8b35ac5100..92da8725a4ae 100644
--- a/stdlib/builtins.pyi
+++ b/stdlib/builtins.pyi
@@ -8,11 +8,11 @@ from _typeshed import (
     OpenTextMode,
     ReadableBuffer,
     Self,
+    SimpleSequence,
     StrOrBytesPath,
     SupportsAnext,
     SupportsDivMod,
     SupportsKeysAndGetItem,
-    SupportsLenAndGetItem,
     SupportsLessThan,
     SupportsLessThanT,
     SupportsNext,
@@ -1293,7 +1293,7 @@ class reversed(Iterator[_T], Generic[_T]):
     @overload
     def __init__(self, __sequence: Reversible[_T]) -> None: ...
     @overload
-    def __init__(self, __sequence: SupportsLenAndGetItem[_T]) -> None: ...
+    def __init__(self, __sequence: SimpleSequence[_T]) -> None: ...
     def __iter__(self) -> Iterator[_T]: ...
     def __next__(self) -> _T: ...