Running specific tests: venv35/bin/pip install pytest beautifulsoup4 aiohttp venv35/bin/pytest tests/test_utils.py

https://github.com/rtfd/readthedocs.org/issues/3812#issuecomment-373780860 suggests Python 3.5.2 may have the fix.

Yup, that worked:

``` pyenv install 3.5.2 rm -rf venv35 /Users/simonw/.pyenv/versions/3.5.2/bin/python -mvenv venv35 source venv35/bin/activate

Not sure why I need this in my local environment but I do:

pip install datasette_plugin_demos python setup.py test ```

This is now giving me the same test failure locally that I am seeing in Travis.

Unfortunately, running python setup.py test on my laptop using Python 3.5.0 in that virtualenv results in a flow of weird Sanic-related errors:

File "/Users/simonw/Dropbox/Development/datasette/venv35/lib/python3.5/site-packages/sanic-0.7.0-py3.5.egg/sanic/testing.py", line 16, in _local_request import aiohttp File "/Users/simonw/Dropbox/Development/datasette/.eggs/aiohttp-2.3.2-py3.5-macosx-10.13-x86_64.egg/aiohttp/__init__.py", line 6, in <module> from .client import * # noqa File "/Users/simonw/Dropbox/Development/datasette/.eggs/aiohttp-2.3.2-py3.5-macosx-10.13-x86_64.egg/aiohttp/client.py", line 13, in <module> from yarl import URL File "/Users/simonw/Dropbox/Development/datasette/.eggs/yarl-1.2.4-py3.5-macosx-10.13-x86_64.egg/yarl/__init__.py", line 11, in <module> from .quoting import _Quoter, _Unquoter File "/Users/simonw/Dropbox/Development/datasette/.eggs/yarl-1.2.4-py3.5-macosx-10.13-x86_64.egg/yarl/quoting.py", line 3, in <module> from typing import Optional, TYPE_CHECKING, cast ImportError: cannot import name 'TYPE_CHECKING'

I managed to get Python 3.5.0 running on my laptop using pyenv. Here's the incantation I used:

```

Install pyenv using homebrew (turns out I already had it)

brew install pyenv

Check which versions of Python I have installed

pyenv versions

Install Python 3.5.0

pyenv install 3.5.0

Figure out where pyenv has been installing things

pyenv root

Check I can run my newly installed Python 3.5.0

/Users/simonw/.pyenv/versions/3.5.0/bin/python

Use it to create a new virtualenv

/Users/simonw/.pyenv/versions/3.5.0/bin/python -mvenv venv35 source venv35/bin/activate

Install datasette into that virtualenv

python setup.py install ```

I'm still seeing intermittent Python 3.5 failures due to dictionary ordering differences.

https://travis-ci.org/simonw/datasette/jobs/378356802

```

  assert expected_facet_results == facet_results

E AssertionError: assert {'city': [{'c...alue': 'MI'}]} == {'city': [{'co...alue': 'MI'}]} E Omitting 1 identical items, use -vv to show E Differing items: E {'city': [{'count': 4, 'toggle_url': '_facet=state&_facet=city&state=MI&city=Detroit', 'value': 'Detroit'}]} != {'city': [{'count': 4, 'toggle_url': 'state=MI&_facet=state&_facet=city&city=Detroit', 'value': 'Detroit'}]} E Use -v to get the full diff ```

To solve these cleanly I need to be able to run Python 3.5 on my local laptop rather than relying on Travis every time.