Example Server Fails to Run with "ImportError: cannot import name 'InvalidURL'"

[jimjkelly]

Long story short

When following the simple example tutorial to run a server both in the docs (http://aiohttp.readthedocs.org/en/stable/web.html#run-a-simple-web-server) and on the site, the server fails to launch.

Expected behaviour

A running server.

Actual behaviour

An exception is raised due to an inability to import InvalidURL. Stack trace:

Traceback (most recent call last):
  File "asyncio.py", line 1, in <module>
    from aiohttp import web
  File "/usr/local/lib/python3.5/site-packages/aiohttp/__init__.py", line 7, in <module>
    from .protocol import *  # noqa
  File "/usr/local/lib/python3.5/site-packages/aiohttp/protocol.py", line 14, in <module>
    from . import errors, hdrs
  File "/usr/local/lib/python3.5/site-packages/aiohttp/errors.py", line 3, in <module>
    from asyncio import TimeoutError
  File "/code/asyncio.py", line 1, in <module>
    from aiohttp import web
  File "/usr/local/lib/python3.5/site-packages/aiohttp/web.py", line 7, in <module>
    from . import web_reqrep
  File "/usr/local/lib/python3.5/site-packages/aiohttp/web_reqrep.py", line 20, in <module>
    from .helpers import reify
  File "/usr/local/lib/python3.5/site-packages/aiohttp/helpers.py", line 15, in <module>
    from .errors import InvalidURL
ImportError: cannot import name 'InvalidURL'

It appears this is a circular import, so it's not surprising that it fails, but then I wonder how it works for other people? I even tried going back to older versions of aiohttp and get the same result. This implies EBKAC, but I'm not sure.

Steps to reproduce

Follow the simple example here: https://github.com/KeepSafe/aiohttp#server

Try and run the script from there.

Your environment

Python 3.5.1 from the official Python Docker Image. (https://github.com/docker-library/python/blob/764d302a21bd2442c2808bc802c95193b2cb8eea/3.5/Dockerfile)
pip install aiohttp (got version 0.21.5)

Thanks!

[asvetlov]

Perhaps your own folder asyncio clashes with standard asyncio package.

File "/code/asyncio.py", line 1, in <module> looks very suspicious.

[jimjkelly]

Well, aren't I red in the face. I knew there must be some EBKAC somewhere in here, and it's quite obvious once you point it out. Thanks, sorry for the dumb question!

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