Here's a Docker image that reproduces the bug.

FROM ubuntu:18.04
RUN apt update && apt install -y python3.7-dbg python3.7-venv python3-venv wget
RUN python3.7 -m venv venv
RUN venv/bin/pip install django
RUN wget https://bugs.python.org/file47688/testproj.tar.gz -O - | tar xfz -
CMD cd /testproj && /venv/bin/python manage.py runserver & sleep 5; wget -t1 localhost:8000 >/dev/null 2>/dev/null

Of course this also works outside Docker. I have reproduced with macOS 10.13.5 (17F77) and Ubuntu 18.04 (Docker).

On macOS it's Python 3.7.0 (default, Jun 29 2018, 20:13:13) [Clang 9.1.0 (clang-902.0.39.2)] on darwin, installed from Homebrew.

On Ubuntu it's whatever is in the 18.04 repositories.