import aioserial
import asyncio


async def read_and_print(aioserial_instance: aioserial.AioSerial):
    while True:
        print((await aioserial_instance.read_async()).decode(errors='ignore'), end='', flush=True)

asyncio.run(read_and_print(aioserial.AioSerial(port='COM1')))

>>> import aioserial
>>> import serial

>>> isinstance(aioserial.AioSerial(), serial.Serial)
True

>>> issubclass(aioserial.AioSerial, serial.Serial)
True

>>> aioserial.Serial is serial.Serial
True

aioserial_instance: aioserial.AioSerial = aioserial.AioSerial(
    # ... same with what can be passed to serial.Serial ...,
    loop: Optional[asyncio.AbstractEventLoop] = None)

bytes_read: bytes = \
    await aioserial_instance.read_async(size: int = 1)

at_most_certain_size_of_bytes_read: bytes = \
    await aioserial_instance.read_until_async(
        expected: bytes = aioserial.LF, size: Optional[int] = None)

number_of_byte_read: int = \
    await aioserial_instance.readinto_async(b: Union[array.array, bytearray])

a_line_of_at_most_certain_size_of_bytes_read: bytes = \
    await aioserial_instance.readline_async(size: int = -1)

lines_of_at_most_certain_size_of_bytes_read: bytes = \
    await aioserial_instance.readlines_async(hint: int = -1)

number_of_byte_like_data_written: int = \
    await aioserial_instance.write_async(bytes_like_data)

number_of_byte_like_data_in_the_given_list_written: int = \
    await aioserial_instance.writelines_async(list_of_bytes_like_data)