It looks like there was a change either on Circle CI’s end or from someone upstream, but I’ve started seeing build failures while trying to deploy. I’m trying to deploy to Google App Engine and it doesn’t accept files with special characters. I’ve patched it to skip the file in question, but probably something to watch out for if it was upstream.
I get the failure:
ERROR: (gcloud.preview.app.deploy) Error Response:  Invalid character in filename: venv/lib/python2.7/site-packages/setuptools/script template (dev).py
It seems to be coming from an included python library in the virtual environments by default when building.