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/code.pyi

@@ -1,4 +1,3 @@
-import sys
 from types import CodeType
 from typing import Any, Callable, Mapping, Optional
 
@@ -12,25 +11,15 @@ class InteractiveInterpreter:
 
 class InteractiveConsole(InteractiveInterpreter):
     def __init__(self, locals: Optional[Mapping[str, Any]] = ..., filename: str = ...) -> None: ...
-    if sys.version_info >= (3, 6):
-        def interact(self, banner: Optional[str] = ..., exitmsg: Optional[str] = ...) -> None: ...
-    else:
-        def interact(self, banner: Optional[str] = ...) -> None: ...
+    def interact(self, banner: Optional[str] = ..., exitmsg: Optional[str] = ...) -> None: ...
     def push(self, line: str) -> bool: ...
     def resetbuffer(self) -> None: ...
     def raw_input(self, prompt: str = ...) -> str: ...
 
-if sys.version_info >= (3, 6):
-    def interact(
-        banner: Optional[str] = ...,
-        readfunc: Optional[Callable[[str], str]] = ...,
-        local: Optional[Mapping[str, Any]] = ...,
-        exitmsg: Optional[str] = ...,
-    ) -> None: ...
-
-else:
-    def interact(
-        banner: Optional[str] = ..., readfunc: Optional[Callable[[str], str]] = ..., local: Optional[Mapping[str, Any]] = ...
-    ) -> None: ...
-
+def interact(
+    banner: Optional[str] = ...,
+    readfunc: Optional[Callable[[str], str]] = ...,
+    local: Optional[Mapping[str, Any]] = ...,
+    exitmsg: Optional[str] = ...,
+) -> None: ...
 def compile_command(source: str, filename: str = ..., symbol: str = ...) -> Optional[CodeType]: ...