When installing easybuild with pip install easybuild using python3 (I tried with python3.5 and python3.6), the built process fails during the sanity checking step with

RuntimeError: dictionary changed size during iteration

that happens in the block line 173 to 177 of easybuild/tools/environment.py. I put the full traceback in attachment because maybe it's a bit too long.

I tried only with a couple of easyconfigs, for instance Julia-1.2.0-linux-x86_64.eb. It can be reproduced with eb --install-latest-eb-release as well.