Update python versions

[flying-sheep]

Hi! Our docs break because of a bugfix that lives in Python 3.7.6 and 3.8.1. You’re using pretty old Python versions:

readthedocs-docker-images/Dockerfile

Lines 151 to 152 in 6e61b2a

	ENV RTD_PYTHON_VERSION_37 3.7.3
	ENV RTD_PYTHON_VERSION_38 3.8.0

Is there a reason why the Python patch versions aren’t kept up to date? They’re super stable. In 10 years of Python coding I never had a single issue arising from a too-new patch release.

TBH it didn’t even occur to me that both Travis and RTD could possibly not update the Python versions as they drop.

[humitos]

Thanks for pointing this out.

Is there a reason why the Python patch versions aren’t kept up to date?

Basically, it's time and effort that doesn't have rewards usually... Until someone hit an issue with this 😄

@flying-sheep what's your project URL just to take a look (and a building URL that fails because of this problem)?

I'll see if I can include the newest patch versions in the Docker images we currently have in production.

[flying-sheep]

There’s some investigation done here: theislab/scanpydoc#20 (comment)

You can see it in action e.g. in this build: https://travis-ci.com/github/theislab/scanpydoc/jobs/390871698