Aiohttp 2.0.5 not installable

Installation
1

While updating to home-assistant 0.42.3 from 0.41 I get errors installing the aiohttp package version 2.0.5.
Neither pip3 install --upgrade aiohttp==2.0.5 nor pip3 install aiohttp==2.0.5 is working.

This is the error I get:
Downloading/unpacking aiohttp==2.0.5
Downloading aiohttp-2.0.5.tar.gz (609kB): 609kB downloaded
Running setup.py (path:/tmp/pip-build-_7okt3o3/aiohttp/setup.py) egg_info for package aiohttp

    Error compiling Cython file:
    ------------------------------------------------------------
    ...
    from .http_writer import HttpVersion, HttpVersion10, HttpVersion11, URL
    from .http_parser import RawRequestMessage, RawResponseMessage, DeflateBuffer
    from .streams import EMPTY_PAYLOAD, FlowControlStreamReader
    
    cimport cython
    from . cimport _cparser as cparser
    ^
    ------------------------------------------------------------
    
    aiohttp/_http_parser.pyx:22:0: 'aiohttp.' is not a valid module name
    Traceback (most recent call last):
      File "<string>", line 17, in <module>
      File "/tmp/pip-build-_7okt3o3/aiohttp/setup.py", line 27, in <module>
        extensions = cythonize(extensions)
      File "/usr/lib/python3/dist-packages/Cython/Build/Dependencies.py", line 840, in cythonize
        cythonize_one(*args[1:])
      File "/usr/lib/python3/dist-packages/Cython/Build/Dependencies.py", line 959, in cythonize_one
        raise CompileError(None, pyx_file)
    Cython.Compiler.Errors.CompileError: aiohttp/_http_parser.pyx
    missing cimport in module '.': aiohttp/_http_parser.pyx
    Compiling aiohttp/_websocket.pyx because it changed.
    Compiling aiohttp/_http_parser.pyx because it changed.
    Cythonizing aiohttp/_http_parser.pyx
    Complete output from command python setup.py egg_info:
    

Error compiling Cython file:

------------------------------------------------------------

...

from .http_writer import HttpVersion, HttpVersion10, HttpVersion11, URL

from .http_parser import RawRequestMessage, RawResponseMessage, DeflateBuffer

from .streams import EMPTY_PAYLOAD, FlowControlStreamReader



cimport cython

from . cimport _cparser as cparser

^

------------------------------------------------------------



aiohttp/_http_parser.pyx:22:0: 'aiohttp.' is not a valid module name

Traceback (most recent call last):

  File "<string>", line 17, in <module>

  File "/tmp/pip-build-_7okt3o3/aiohttp/setup.py", line 27, in <module>

    extensions = cythonize(extensions)

  File "/usr/lib/python3/dist-packages/Cython/Build/Dependencies.py", line 840, in cythonize

    cythonize_one(*args[1:])

  File "/usr/lib/python3/dist-packages/Cython/Build/Dependencies.py", line 959, in cythonize_one

    raise CompileError(None, pyx_file)

Cython.Compiler.Errors.CompileError: aiohttp/_http_parser.pyx

missing cimport in module '.': aiohttp/_http_parser.pyx

Compiling aiohttp/_websocket.pyx because it changed.

Compiling aiohttp/_http_parser.pyx because it changed.

Cythonizing aiohttp/_http_parser.pyx

----------------------------------------
Cleaning up...
Command python setup.py egg_info failed with error code 1 in /tmp/pip-build-_7okt3o3/aiohttp
Storing debug log for failure in /home/homeassistant/.pip/pip.log
2

@tedstriker

You followed these exact steps?

3

I followed these steps exactly. But it seems like I haven’t setup the virtual env properly in first place.
What I tried recently is to set include-system-site-packages = false in pyenv.cfg with success.

I went through the steps setting up the virtual environment again and now everything runs fine.
Thank you for pointing in the right direction.