* DOC: Add a description to build docs for anaconda users
Co-authored-by: Yoshinobu Nakada <yoshinobu.a.nakada@rakuten.com>
Co-authored-by: Richard Frank <richafrank@users.noreply.github.com>
This script, and the associated changes, help avoid strange problems
with Python 3, pdbpp, and concurrent.futures related to ordering and
side effects from .pth files.
Without them, under certain, possibly nondeterministic circumstances,
installing zipline's dependencies in Python 3 will cause the
concurrent.futures backport to shadow the stdlib module, which breaks
pip (among other things) with a SyntaxError.
