Yank installation Python3.10 import error

[JonaTheHutt]

Hi all,

just encountered an error when trying to install Yank 0.25.2 w/ python3.10:

class CombinatorialTree(collections.MutableMapping): AttributeError: module 'collections' has no attribute 'MutableMapping'

Changing the import statements to

import collections.abc

abd renaming the class attribute solved the issue for now, maybe this can be fixed.

class CombinatorialTree(collections.abc.MutableMapping)

[mikemhenry]

I'm working on fixing this here: #1286
Yank right now isn't getting a ton of attention but it is on on radar, thanks for the bug report!

For now, hopefully you can just use an older python version.