builtins confusion

[Thomas Jollans]

On 2018-11-05 10:47, Robin Becker wrote:
>     raise ImportError('This package should not be accessible on Python 3. '
>                       'Either you are trying to run from the python-future src folder '
>                       'or your installation of python-future is corrupted.')

It would appear that this is from the python-future package.

The PyPI page makes the "why?" fairly clear:
  https://pypi.org/project/future/