Poetry will lock with two different versions of pandas if numpy is pinned

• I am on the latest Poetry version.

• I have searched the issues of this repo and believe that this is not a duplicate.

• If an exception occurs when executing a command, I executed it again in debug mode (-vvv option).

• OS version and name: Ubuntu 20.04

• Poetry version: 1.1.11

• Link of a Gist with the contents of your pyproject.toml file: https://gist.github.com/J-France/70df79b776c2e5722eb37773472d5d92

Issue

Poetry will lock to two different versions of pandas if numpy is set to a fixed version. The following command will install pandas 1.3.4 into the virtual environment

poetry add numpy=1.20.1 pandas="*"

However the lock file contains two versions (1.3.3 and 1.3.4) as well as various poetry commands returning different versions

• poetry export returns 1.3.3
• poetry show return 1.3.4
• poetry show --tree returns both 1.3.3 and 1.3.4

Reproduce the issue with poetry add numpy=1.20.1 pandas="*", then compare the lock file with the results of poetry export, poetry show, and poetry show --tree. Trace how dependency resolution and these commands select pandas versions; done means the lock file and all commands consistently report one compatible pandas version.