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/wave.pyi

@@ -1,5 +1,5 @@
 import sys
-from typing import IO, Any, BinaryIO, NamedTuple, NoReturn, Optional, Text, Tuple, Union
+from typing import IO, Any, BinaryIO, NamedTuple, NoReturn, Optional, Text, Union
 
 _File = Union[Text, IO[bytes]]
 
@@ -7,23 +7,18 @@ class Error(Exception): ...
 
 WAVE_FORMAT_PCM: int
 
-if sys.version_info >= (3, 0):
-    class _wave_params(NamedTuple):
-        nchannels: int
-        sampwidth: int
-        framerate: int
-        nframes: int
-        comptype: str
-        compname: str
-
-else:
-    _wave_params = Tuple[int, int, int, int, str, str]
+class _wave_params(NamedTuple):
+    nchannels: int
+    sampwidth: int
+    framerate: int
+    nframes: int
+    comptype: str
+    compname: str
 
 class Wave_read:
     def __init__(self, f: _File) -> None: ...
-    if sys.version_info >= (3, 0):
-        def __enter__(self) -> Wave_read: ...
-        def __exit__(self, *args: Any) -> None: ...
+    def __enter__(self) -> Wave_read: ...
+    def __exit__(self, *args: Any) -> None: ...
     def getfp(self) -> Optional[BinaryIO]: ...
     def rewind(self) -> None: ...
     def close(self) -> None: ...
@@ -42,9 +37,8 @@ class Wave_read:
 
 class Wave_write:
     def __init__(self, f: _File) -> None: ...
-    if sys.version_info >= (3, 0):
-        def __enter__(self) -> Wave_write: ...
-        def __exit__(self, *args: Any) -> None: ...
+    def __enter__(self) -> Wave_write: ...
+    def __exit__(self, *args: Any) -> None: ...
     def setnchannels(self, nchannels: int) -> None: ...
     def getnchannels(self) -> int: ...
     def setsampwidth(self, sampwidth: int) -> None: ...