pyserial: Fix read and write methods (#9825)

stubs/pyserial/serial/rfc2217.pyi

@@ -1,4 +1,5 @@
 import logging
+from _typeshed import ReadableBuffer
 from collections.abc import Callable, Generator
 from typing import Any
 
@@ -149,6 +150,8 @@ class Serial(SerialBase):
     def from_url(self, url: str) -> tuple[str, int]: ...
     @property
     def in_waiting(self) -> int: ...
+    def read(self, size: int = 1) -> bytes: ...
+    def write(self, __b: ReadableBuffer) -> int | None: ...
     def reset_input_buffer(self) -> None: ...
     def reset_output_buffer(self) -> None: ...
     @property

stubs/pyserial/serial/serialcli.pyi

@@ -1,3 +1,4 @@
+from _typeshed import ReadableBuffer
 from typing import Any
 
 from serial.serialutil import *
@@ -10,6 +11,8 @@ class Serial(SerialBase):
     def open(self) -> None: ...
     @property
     def in_waiting(self) -> int: ...
+    def read(self, size: int = 1) -> bytes: ...
+    def write(self, __b: ReadableBuffer) -> int | None: ...
     def reset_input_buffer(self) -> None: ...
     def reset_output_buffer(self) -> None: ...
     @property

stubs/pyserial/serial/serialjava.pyi

@@ -1,3 +1,4 @@
+from _typeshed import ReadableBuffer
 from collections.abc import Iterable
 from typing import Any
 
@@ -15,6 +16,8 @@ class Serial(SerialBase):
     def open(self) -> None: ...
     @property
     def in_waiting(self) -> int: ...
+    def read(self, size: int = 1) -> bytes: ...
+    def write(self, __b: ReadableBuffer) -> int | None: ...
     def reset_input_buffer(self) -> None: ...
     def reset_output_buffer(self) -> None: ...
     @property

stubs/pyserial/serial/serialposix.pyi

@@ -1,4 +1,5 @@
 import sys
+from _typeshed import ReadableBuffer
 from typing_extensions import Never
 
 from serial.serialutil import SerialBase
@@ -64,8 +65,10 @@ class Serial(SerialBase, PlatformSpecific):
     def open(self) -> None: ...
     @property
     def in_waiting(self) -> int: ...
+    def read(self, size: int = 1) -> bytes: ...
     def cancel_read(self) -> None: ...
     def cancel_write(self) -> None: ...
+    def write(self, __b: ReadableBuffer) -> int | None: ...
     def reset_input_buffer(self) -> None: ...
     def reset_output_buffer(self) -> None: ...
     def send_break(self, duration: float = ...) -> None: ...

stubs/pyserial/serial/serialutil.pyi

@@ -1,4 +1,6 @@
 import io
+from _typeshed import ReadableBuffer, WriteableBuffer
+from abc import abstractmethod
 from collections.abc import Callable, Generator
 from typing import Any
 from typing_extensions import Final
@@ -63,7 +65,21 @@ class SerialBase(io.RawIOBase):
         inter_byte_timeout: float | None = ...,
         exclusive: float | None = ...,
     ) -> None: ...
-    def read(self, __size: int = ...) -> bytes: ...  # same as io.RawIOBase.read but always returns bytes
+
+    # Return type:
+    # ------------
+    # `io.RawIOBase`, the super class, declares the return type of read as `-> bytes | None`.
+    # `SerialBase` does not define `read` at runtime but REQUIRES subclasses to implement it and
+    # require it to return `bytes`.
+    # Abstract:
+    # ---------
+    # `io.RawIOBase` implements `read` in terms of `readinto`. `SerialBase` implements `readinto`
+    # in terms of `read`. If subclasses do not implement `read`, any call to `read` or `read_into`
+    # will fail at runtime with a `RecursionError`.
+    @abstractmethod
+    def read(self, __size: int = -1) -> bytes: ...
+    @abstractmethod
+    def write(self, __b: ReadableBuffer) -> int | None: ...
     @property
     def port(self) -> str | None: ...
     @port.setter
@@ -130,6 +146,7 @@ class SerialBase(io.RawIOBase):
     def rs485_mode(self, rs485_settings: RS485Settings | None) -> None: ...
     def get_settings(self) -> dict[str, Any]: ...
     def apply_settings(self, d: dict[str, Any]) -> None: ...
+    def readinto(self, __buffer: WriteableBuffer) -> int: ...  # returns int unlike `io.RawIOBase`
     def send_break(self, duration: float = ...) -> None: ...
     def read_all(self) -> bytes | None: ...
     def read_until(self, expected: bytes = ..., size: int | None = ...) -> bytes: ...

stubs/pyserial/serial/serialwin32.pyi

@@ -1,9 +1,13 @@
+from _typeshed import ReadableBuffer
+
 from serial.serialutil import SerialBase
 
 class Serial(SerialBase):
     def open(self) -> None: ...
     @property
     def in_waiting(self) -> int: ...
+    def read(self, size: int = 1) -> bytes: ...
+    def write(self, __b: ReadableBuffer) -> int | None: ...
     def reset_input_buffer(self) -> None: ...
     def reset_output_buffer(self) -> None: ...
     @property

stubs/pyserial/serial/urlhandler/protocol_cp2110.pyi

@@ -1,3 +1,5 @@
+from _typeshed import ReadableBuffer
+
 from serial.serialutil import SerialBase
 
 class Serial(SerialBase):
@@ -7,3 +9,5 @@ class Serial(SerialBase):
     def in_waiting(self) -> int: ...
     def reset_input_buffer(self) -> None: ...
     def reset_output_buffer(self) -> None: ...
+    def read(self, size: int = 1) -> bytes: ...
+    def write(self, __b: ReadableBuffer) -> int | None: ...

stubs/pyserial/serial/urlhandler/protocol_loop.pyi

@@ -1,5 +1,6 @@
 import logging
 import queue
+from _typeshed import ReadableBuffer
 
 from serial.serialutil import SerialBase
 
@@ -13,8 +14,10 @@ class Serial(SerialBase):
     def from_url(self, url: str) -> None: ...
     @property
     def in_waiting(self) -> int: ...
+    def read(self, size: int = 1) -> bytes: ...
     def cancel_read(self) -> None: ...
     def cancel_write(self) -> None: ...
+    def write(self, __b: ReadableBuffer) -> int | None: ...
     def reset_input_buffer(self) -> None: ...
     def reset_output_buffer(self) -> None: ...
     @property

stubs/pyserial/serial/urlhandler/protocol_socket.pyi

@@ -1,4 +1,5 @@
 import logging
+from _typeshed import ReadableBuffer
 
 from serial.serialutil import SerialBase
 
@@ -11,6 +12,8 @@ class Serial(SerialBase):
     def from_url(self, url: str) -> tuple[str, int]: ...
     @property
     def in_waiting(self) -> int: ...
+    def read(self, size: int = 1) -> bytes: ...
+    def write(self, __b: ReadableBuffer) -> int | None: ...
     def reset_input_buffer(self) -> None: ...
     def reset_output_buffer(self) -> None: ...
     @property