diff --git a/stdlib/builtins.pyi b/stdlib/builtins.pyi
index c880d5d8c..e83c36be8 100644
--- a/stdlib/builtins.pyi
+++ b/stdlib/builtins.pyi
@@ -335,10 +335,10 @@ class str(Sequence[str]):
         self, __suffix: Union[str, Tuple[str, ...]], __start: Optional[int] = ..., __end: Optional[int] = ...
     ) -> bool: ...
     def expandtabs(self, tabsize: int = ...) -> str: ...
-    def find(self, sub: str, __start: Optional[int] = ..., __end: Optional[int] = ...) -> int: ...
+    def find(self, __sub: str, __start: Optional[int] = ..., __end: Optional[int] = ...) -> int: ...
     def format(self, *args: object, **kwargs: object) -> str: ...
     def format_map(self, map: _FormatMapMapping) -> str: ...
-    def index(self, sub: str, __start: Optional[int] = ..., __end: Optional[int] = ...) -> int: ...
+    def index(self, __sub: str, __start: Optional[int] = ..., __end: Optional[int] = ...) -> int: ...
     def isalnum(self) -> bool: ...
     def isalpha(self) -> bool: ...
     if sys.version_info >= (3, 7):
@@ -361,8 +361,8 @@ class str(Sequence[str]):
     if sys.version_info >= (3, 9):
         def removeprefix(self, __prefix: str) -> str: ...
         def removesuffix(self, __suffix: str) -> str: ...
-    def rfind(self, sub: str, __start: Optional[int] = ..., __end: Optional[int] = ...) -> int: ...
-    def rindex(self, sub: str, __start: Optional[int] = ..., __end: Optional[int] = ...) -> int: ...
+    def rfind(self, __sub: str, __start: Optional[int] = ..., __end: Optional[int] = ...) -> int: ...
+    def rindex(self, __sub: str, __start: Optional[int] = ..., __end: Optional[int] = ...) -> int: ...
     def rjust(self, __width: int, __fillchar: str = ...) -> str: ...
     def rpartition(self, __sep: str) -> Tuple[str, str, str]: ...
     def rsplit(self, sep: Optional[str] = ..., maxsplit: int = ...) -> List[str]: ...
@@ -417,18 +417,18 @@ class bytes(ByteString):
     def __new__(cls: Type[_T], o: SupportsBytes) -> _T: ...
     def capitalize(self) -> bytes: ...
     def center(self, __width: int, __fillchar: bytes = ...) -> bytes: ...
-    def count(self, sub: Union[bytes, int], start: Optional[int] = ..., end: Optional[int] = ...) -> int: ...
+    def count(self, __sub: Union[bytes, int], __start: Optional[int] = ..., __end: Optional[int] = ...) -> int: ...
     def decode(self, encoding: str = ..., errors: str = ...) -> str: ...
     def endswith(
         self, __suffix: Union[bytes, Tuple[bytes, ...]], __start: Optional[int] = ..., __end: Optional[int] = ...
     ) -> bool: ...
     def expandtabs(self, tabsize: int = ...) -> bytes: ...
-    def find(self, sub: Union[bytes, int], start: Optional[int] = ..., end: Optional[int] = ...) -> int: ...
+    def find(self, __sub: Union[bytes, int], __start: Optional[int] = ..., __end: Optional[int] = ...) -> int: ...
     if sys.version_info >= (3, 8):
         def hex(self, sep: Union[str, bytes] = ..., bytes_per_sep: int = ...) -> str: ...
     else:
         def hex(self) -> str: ...
-    def index(self, sub: Union[bytes, int], start: Optional[int] = ..., end: Optional[int] = ...) -> int: ...
+    def index(self, __sub: Union[bytes, int], __start: Optional[int] = ..., __end: Optional[int] = ...) -> int: ...
     def isalnum(self) -> bool: ...
     def isalpha(self) -> bool: ...
     if sys.version_info >= (3, 7):
@@ -447,8 +447,8 @@ class bytes(ByteString):
     if sys.version_info >= (3, 9):
         def removeprefix(self, __prefix: bytes) -> bytes: ...
         def removesuffix(self, __suffix: bytes) -> bytes: ...
-    def rfind(self, sub: Union[bytes, int], start: Optional[int] = ..., end: Optional[int] = ...) -> int: ...
-    def rindex(self, sub: Union[bytes, int], start: Optional[int] = ..., end: Optional[int] = ...) -> int: ...
+    def rfind(self, __sub: Union[bytes, int], __start: Optional[int] = ..., __end: Optional[int] = ...) -> int: ...
+    def rindex(self, __sub: Union[bytes, int], __start: Optional[int] = ..., __end: Optional[int] = ...) -> int: ...
     def rjust(self, __width: int, __fillchar: bytes = ...) -> bytes: ...
     def rpartition(self, __sep: bytes) -> Tuple[bytes, bytes, bytes]: ...
     def rsplit(self, sep: Optional[bytes] = ..., maxsplit: int = ...) -> List[bytes]: ...