Remove Python 3.7 branches (#11238)

stdlib/types.pyi

@@ -45,11 +45,9 @@ __all__ = [
     "MethodWrapperType",
     "WrapperDescriptorType",
     "resolve_bases",
+    "CellType",
 ]
 
-if sys.version_info >= (3, 8):
-    __all__ += ["CellType"]
-
 if sys.version_info >= (3, 9):
     __all__ += ["GenericAlias"]
 
@@ -68,9 +66,7 @@ _VT_co = TypeVar("_VT_co", covariant=True)
 
 @final
 class _Cell:
-    if sys.version_info >= (3, 8):
-        def __new__(cls, __contents: object = ...) -> Self: ...
-
+    def __new__(cls, __contents: object = ...) -> Self: ...
     def __eq__(self, __value: object) -> bool: ...
     __hash__: ClassVar[None]  # type: ignore[assignment]
     cell_contents: Any
@@ -118,10 +114,8 @@ class CodeType:
     def __hash__(self) -> int: ...
     @property
     def co_argcount(self) -> int: ...
-    if sys.version_info >= (3, 8):
-        @property
-        def co_posonlyargcount(self) -> int: ...
-
+    @property
+    def co_posonlyargcount(self) -> int: ...
     @property
     def co_kwonlyargcount(self) -> int: ...
     @property
@@ -203,30 +197,11 @@ class CodeType:
             __freevars: tuple[str, ...] = ...,
             __cellvars: tuple[str, ...] = ...,
         ) -> Self: ...
-    elif sys.version_info >= (3, 8):
-        def __new__(
-            cls,
-            __argcount: int,
-            __posonlyargcount: int,
-            __kwonlyargcount: int,
-            __nlocals: int,
-            __stacksize: int,
-            __flags: int,
-            __codestring: bytes,
-            __constants: tuple[object, ...],
-            __names: tuple[str, ...],
-            __varnames: tuple[str, ...],
-            __filename: str,
-            __name: str,
-            __firstlineno: int,
-            __lnotab: bytes,
-            __freevars: tuple[str, ...] = ...,
-            __cellvars: tuple[str, ...] = ...,
-        ) -> Self: ...
     else:
         def __new__(
             cls,
             __argcount: int,
+            __posonlyargcount: int,
             __kwonlyargcount: int,
             __nlocals: int,
             __stacksize: int,
@@ -286,7 +261,7 @@ class CodeType:
             co_name: str = ...,
             co_linetable: bytes = ...,
         ) -> CodeType: ...
-    elif sys.version_info >= (3, 8):
+    else:
         def replace(
             self,
             *,
@@ -515,7 +490,7 @@ class ClassMethodDescriptorType:
 class TracebackType:
     def __new__(cls, tb_next: TracebackType | None, tb_frame: FrameType, tb_lasti: int, tb_lineno: int) -> Self: ...
     tb_next: TracebackType | None
-    # the rest are read-only even in 3.7
+    # the rest are read-only
     @property
     def tb_frame(self) -> FrameType: ...
     @property
@@ -598,8 +573,7 @@ def coroutine(func: Callable[_P, Generator[Any, Any, _R]]) -> Callable[_P, Await
 @overload
 def coroutine(func: _Fn) -> _Fn: ...
 
-if sys.version_info >= (3, 8):
-    CellType = _Cell
+CellType = _Cell
 
 if sys.version_info >= (3, 9):
     class GenericAlias: