Cannot import name "Feature" from "setuptools"ってなったとき。

ERROR: Command errored out with exit status 1:

【中略】

interface/
    Complete output (5 lines):
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/private/var/folders/69/cj8h85bs7cvbxs4l0qqlwdxh0000gn/T/pip-install-nz65irhj/zope.interface/setup.py", line 26, in <module>
        from setuptools import setup, Extension, Feature
    ImportError: cannot import name 'Feature' from 'setuptools' 
    ----------------------------------------
ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.

ってな感じになったとき

pip3 install setuptools==45

して解消する。

Ref.