Poetry refuses to upgrade projects that bound the Python version

Please see my comment and @rgommers’s reply here.

Because SciPy (and soon NumPy) have an upper bound version set to be “❤️.10”, Poetry refuses to upgrade SciPy on any project that leaves the Python version unbounded. Poetry says:

   1: fact: scipy (1.7.0) requires Python >=3.7,<3.10
   1: derived: not scipy (==1.7.0)
   1: fact: scipy (1.6.3) requires Python >=3.7,<3.10
   1: derived: not scipy (==1.6.3)
   1: fact: scipy (1.6.2) requires Python >=3.7,<3.10
   1: derived: not scipy (==1.6.2)
   1: fact: scipy (1.6.0) depends on numpy (>=1.16.5)
   1: selecting scipy (1.6.0)

This means that all projects either need to inherit this upper bound in order to get updates. Does that make sense? Or would it be better for Poetry to not derive the above facts? After all, when poetry update is called, the Python version is fixed.

[rgommers]

Also, I’m just curious, but do packages ever go from releasing wheels to not releasing wheels?–in which case your idea would make it so that you would be stuck using past versions?

Highly unusual. In most cases it’s a temporary issue, like the release manager uploading an sdist first and the wheels after. I’ve done this before and gotten bug reports about it within an hour, it’s an easy mistake to make.

There’s a way to accommodate those projects though that do it on purpose, there’s a design tradeoff to make here between:

1. don’t accept sdists at all if a project has a wheel for any version
2. accept sdists only if there are no wheels for that version or any newer version

(2) seems good enough and would not break anything for projects that at some point decided to stop shipping wheels.

Perhaps you should open an issue?

I will try to do that sometime in the next week, with some more context and a suggested design change.

[rgommers]

I wasn’t sure, and thought that that would be unnecessary work in bumping that bound on all my projects every time a new Python version comes out

It’d be nice if it wasn’t needed, I think it’s still odd that it is - but that’s up to the Poetry devs.