Akuli and srittau: Remove Python 2 branches from Python 3 stubs (#5461)

* run script and do some manual changes (Akuli)

* do the whole thing manually (srittau)

* merge changes (Akuli)

Co-authored-by: Sebastian Rittau <srittau@rittau.biz>

stdlib/_warnings.pyi

@@ -1,67 +1,32 @@
-import sys
 from typing import Any, Dict, List, Optional, Tuple, Type, Union, overload
 
-if sys.version_info >= (3, 0):
-    _defaultaction: str
-    _onceregistry: Dict[Any, Any]
-else:
-    default_action: str
-    once_registry: Dict[Any, Any]
-
+_defaultaction: str
+_onceregistry: Dict[Any, Any]
 filters: List[Tuple[Any, ...]]
 
-if sys.version_info >= (3, 6):
-    @overload
-    def warn(
-        message: str, category: Optional[Type[Warning]] = ..., stacklevel: int = ..., source: Optional[Any] = ...
-    ) -> None: ...
-    @overload
-    def warn(message: Warning, category: Any = ..., stacklevel: int = ..., source: Optional[Any] = ...) -> None: ...
-    @overload
-    def warn_explicit(
-        message: str,
-        category: Type[Warning],
-        filename: str,
-        lineno: int,
-        module: Optional[str] = ...,
-        registry: Optional[Dict[Union[str, Tuple[str, Type[Warning], int]], int]] = ...,
-        module_globals: Optional[Dict[str, Any]] = ...,
-        source: Optional[Any] = ...,
-    ) -> None: ...
-    @overload
-    def warn_explicit(
-        message: Warning,
-        category: Any,
-        filename: str,
-        lineno: int,
-        module: Optional[str] = ...,
-        registry: Optional[Dict[Union[str, Tuple[str, Type[Warning], int]], int]] = ...,
-        module_globals: Optional[Dict[str, Any]] = ...,
-        source: Optional[Any] = ...,
-    ) -> None: ...
-
-else:
-    @overload
-    def warn(message: str, category: Optional[Type[Warning]] = ..., stacklevel: int = ...) -> None: ...
-    @overload
-    def warn(message: Warning, category: Any = ..., stacklevel: int = ...) -> None: ...
-    @overload
-    def warn_explicit(
-        message: str,
-        category: Type[Warning],
-        filename: str,
-        lineno: int,
-        module: Optional[str] = ...,
-        registry: Optional[Dict[Union[str, Tuple[str, Type[Warning], int]], int]] = ...,
-        module_globals: Optional[Dict[str, Any]] = ...,
-    ) -> None: ...
-    @overload
-    def warn_explicit(
-        message: Warning,
-        category: Any,
-        filename: str,
-        lineno: int,
-        module: Optional[str] = ...,
-        registry: Optional[Dict[Union[str, Tuple[str, Type[Warning], int]], int]] = ...,
-        module_globals: Optional[Dict[str, Any]] = ...,
-    ) -> None: ...
+@overload
+def warn(message: str, category: Optional[Type[Warning]] = ..., stacklevel: int = ..., source: Optional[Any] = ...) -> None: ...
+@overload
+def warn(message: Warning, category: Any = ..., stacklevel: int = ..., source: Optional[Any] = ...) -> None: ...
+@overload
+def warn_explicit(
+    message: str,
+    category: Type[Warning],
+    filename: str,
+    lineno: int,
+    module: Optional[str] = ...,
+    registry: Optional[Dict[Union[str, Tuple[str, Type[Warning], int]], int]] = ...,
+    module_globals: Optional[Dict[str, Any]] = ...,
+    source: Optional[Any] = ...,
+) -> None: ...
+@overload
+def warn_explicit(
+    message: Warning,
+    category: Any,
+    filename: str,
+    lineno: int,
+    module: Optional[str] = ...,
+    registry: Optional[Dict[Union[str, Tuple[str, Type[Warning], int]], int]] = ...,
+    module_globals: Optional[Dict[str, Any]] = ...,
+    source: Optional[Any] = ...,
+) -> None: ...