Provide shortcut for aprint?

[yuxincs]

Currently the print function doesn't work well with async code. see at https://gist.github.com/nathan-hoad/8966377#gistcomment-1222842

If you feed a few hundred bytes into print function, you will see BlockingIOError.

It is very easy to solve this problem in aioconsole IMO

A sample code could be:

from aioconsole.stream import get_standard_streams

async def aprint(string):
    _, writer = get_standard_streams()
    writer.write(string.encode('utf-8'))
    writer.write('\n'.encode('utf-8'))
    await writer.drain()

Perhaps provide a shortcut for aprint might be easy for developers since we have ainput in the package.

[vxgmichel]

Hi @RyanWangGit and thanks for your report!

For the reference, the issue can be reproduced with the following code:

import asyncio
from aioconsole import get_standard_streams

async def main():
    _, writer = await get_standard_streams()
    print('a'*64*1024)
    # print('a'*64*1024, file=writer)
    # print('OK', file=writer)
    # await writer.drain()

if __name__ == '__main__':
    asyncio.run(main())

It produces the following error:

Traceback (most recent call last):
  File "test.py", line 12, in <module>
    asyncio.run(main())
  File "/home/vimiche/miniconda/lib/python3.7/asyncio/runners.py", line 43, in run
    return loop.run_until_complete(main)
  File "/home/vimiche/miniconda/lib/python3.7/asyncio/base_events.py", line 568, in run_until_complete
    return future.result()
  File "test.py", line 6, in main
    print('a'*64*1024)
BlockingIOError: [Errno 11] write could not complete without blocking

While investigating this, I also realized there was an issue with the handling of linux pipes (see #32).

Perhaps provide a shortcut for aprint might be easy for developers since we have ainput in the package.

Sounds good!