CODEWITHSUNDEEP
inputpython-3.6python-asyncio
srbcheema1
srbcheema1

Reputation: 610

unable to read file from standard input in asyncio

I have written a code that works on asyncio. In that code I had to read a file from standard input using ./check.py < file.txt I am able to give input from terminal. normally it works fine. But it doesn't work for reading data from file from standard input.

#!/usr/bin/env python3.6

import asyncio
from aioconsole import ainput

async def read_input():
    while True:
        inp = await ainput()
        print('got ' + inp)

if (__name__ == "__main__"):
    asyncio.get_event_loop().run_until_complete(read_input())

normally it works like

$ ./check.py 
4
got 4
5
got 5

But while reading from file directly I face this log:

$ ./check.py < test/test_case 
Traceback (most recent call last):
  File "./check.py", line 12, in <module>
    asyncio.get_event_loop().run_until_complete(read_input())
  File "/usr/lib/python3.6/asyncio/base_events.py", line 468, in run_until_complete
    return future.result()
  File "./check.py", line 8, in read_input
    inp = await ainput()
  File "/usr/local/lib/python3.6/dist-packages/aioconsole/stream.py", line 156, in ainput
    reader, writer = yield from get_standard_streams(loop=loop)
  File "/usr/local/lib/python3.6/dist-packages/aioconsole/stream.py", line 144, in get_standard_streams
    cache[key] = yield from connection
  File "/usr/local/lib/python3.6/dist-packages/aioconsole/stream.py", line 132, in create_standard_streams
    reader, writer = yield from future
  File "/usr/local/lib/python3.6/dist-packages/aioconsole/stream.py", line 114, in open_pipe_connection
    yield from loop.connect_read_pipe(lambda: protocol, pipe_in)
  File "/usr/lib/python3.6/asyncio/base_events.py", line 1099, in connect_read_pipe
    transport = self._make_read_pipe_transport(pipe, protocol, waiter)
  File "/usr/lib/python3.6/asyncio/unix_events.py", line 185, in _make_read_pipe_transport
    return _UnixReadPipeTransport(self, pipe, protocol, waiter, extra)
  File "/usr/lib/python3.6/asyncio/unix_events.py", line 353, in __init__
    raise ValueError("Pipe transport is for pipes/sockets only.")
ValueError: Pipe transport is for pipes/sockets only.

Unable to get why is it behaving differently ? I want to read a file like ./check.py < file.txt using coroutines.

Upvotes: 1

Views: 836

Answers (1)

Vincent
Vincent

Reputation: 13415

It's a bug that has been fixed in aioconsole v0.1.9.

Simply run the following command to get the latest version:

$ pip3 install -U aioconsole

Upvotes: 1

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