Add missing annotations for psutil (#6124)

Author: saaketp

stubs/psutil/psutil/__init__.pyi

@@ -1,5 +1,5 @@
 import sys
-from typing import Any, Callable, ContextManager, Iterable, Iterator, TypeVar
+from typing import Any, Callable, ContextManager, Iterable, Iterator, Tuple, TypeVar
 
 from ._common import (
     AIX as AIX,
@@ -97,6 +97,16 @@ if sys.platform == "win32":
         win_service_iter as win_service_iter,
     )
 
+if sys.platform == "linux":
+    from ._pslinux import pfullmem, pmem
+elif sys.platform == "darwin":
+    from ._psosx import pfullmem, pmem
+elif sys.platform == "win32":
+    from ._pswindows import pfullmem, pmem
+else:
+    pmem = Any
+    pfullmem = Any
+
 if sys.platform == "linux":
     PROCFS_PATH: str
 AF_LINK: int
@@ -106,20 +116,22 @@ __author__: str
 
 class Process:
     def __init__(self, pid: int | None = ...) -> None: ...
-    def __eq__(self, other) -> bool: ...
-    def __ne__(self, other) -> bool: ...
+    def __eq__(self, other: object) -> bool: ...
+    def __ne__(self, other: object) -> bool: ...
     def __hash__(self) -> int: ...
     @property
     def pid(self) -> int: ...
     def oneshot(self) -> ContextManager[None]: ...
-    def as_dict(self, attrs: Any | None = ..., ad_value: Any | None = ...): ...
+    def as_dict(
+        self, attrs: list[str] | Tuple[str, ...] | set[str] | frozenset[str] | None = ..., ad_value: Any | None = ...
+    ) -> dict[str, Any]: ...
     def parent(self) -> Process: ...
     def parents(self) -> list[Process]: ...
     def is_running(self) -> bool: ...
     def ppid(self) -> int: ...
     def name(self) -> str: ...
     def exe(self) -> str: ...
-    def cmdline(self): ...
+    def cmdline(self) -> list[str]: ...
     def status(self) -> int: ...
     def username(self) -> str: ...
     def create_time(self) -> float: ...
@@ -148,9 +160,9 @@ class Process:
     def children(self, recursive: bool = ...) -> list[Process]: ...
     def cpu_percent(self, interval: float | None = ...) -> float: ...
     def cpu_times(self) -> pcputimes: ...
-    def memory_info(self): ...
-    def memory_info_ex(self): ...
-    def memory_full_info(self): ...
+    def memory_info(self) -> pmem: ...
+    def memory_info_ex(self) -> pmem: ...
+    def memory_full_info(self) -> pfullmem: ...
     def memory_percent(self, memtype: str = ...) -> float: ...
     if sys.platform != "darwin":
         def memory_maps(self, grouped: bool = ...): ...
@@ -173,7 +185,9 @@ class Popen(Process):
 
 def pids() -> list[int]: ...
 def pid_exists(pid: int) -> bool: ...
-def process_iter(attrs: Any | None = ..., ad_value: Any | None = ...) -> Iterator[Process]: ...
+def process_iter(
+    attrs: list[str] | Tuple[str, ...] | set[str] | frozenset[str] | None = ..., ad_value: Any | None = ...
+) -> Iterator[Process]: ...
 def wait_procs(
     procs: Iterable[Process], timeout: float | None = ..., callback: Callable[[Process], Any] | None = ...
 ) -> tuple[list[Process], list[Process]]: ...