Python 3.7: Keyview iteration raises a StopIteration RuntimeError

[s-d-penning]

I am using version 1.3.6 and under Python 3.6 I can use a for loop to iterate over the KeysView. When I change to Python 3.7 I encounter a 'generator raised StopIteration' RuntimeError at the end of the iteration.

PEP 479 -- Change StopIteration handling inside generators

[elihunter173]

I'm not sure if you're still facing this issue, but we're switching to sortedcontainers because of this issue. It should be a (mostly) drop in fix.

[h-vetinari]

This is solved for the conda-forge packaging effort with patch 3 in the feedstock repo.