anchor.diff:      && rm -rf /tmp/readthedocs.org-${RTD_COMMIT}*
   
   WORKDIR ${RTD_REPO_DIR}
  -RUN pip install -r requirements.txt \
  +RUN pip3 install -r requirements.txt \
       && rm -rf ~/.cache /tmp/pip_build_root \
  -    && python ./manage.py migrate \
  -    && python -c "import os;import sys;os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'readthedocs.settings.dev');sys.path.append(os.getcwd());from django.contrib.auth.models import User;admin = User.objects.create_user('admin','','admin');admin.is_superuser=True;admin.is_staff=True;admin.save();test = User.objects.create_user('test','','test');test.is_staff=True;test.save();" \
  -    && python ./manage.py collectstatic --noinput
  +    && python3 ./manage.py migrate \
  +    && python3 -c "import os;import sys;os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'readthedocs.settings.dev');sys.path.append(os.getcwd());from django.contrib.auth.models import User;admin = User.objects.create_user('admin','','admin');admin.is_superuser=True;admin.is_staff=True;admin.save();test = User.objects.create_user('test','','test');test.is_staff=True;test.save();" \
  +    && python3 ./manage.py collectstatic --noinput
   
   EXPOSE 8000
   
  -CMD ["python", "./manage.py", "runserver", "0.0.0.0:8000"]
  +CMD ["python3", "./manage.py", "runserver", "0.0.0.0:8000"]
  
positive.code:         libxml2-dev \
          libxslt1-dev \
          libz-dev \
          python-dev \
          python-pip \
          python-setuptools \
          texlive-latex-recommended \
          texlive-fonts-recommended \
  
negative.code: FROM debian:stretch-slim
  MAINTAINER qqbuby <qqbuby@gmail.com>
  
  ENV RTD_REPO_DIR=/var/readthedocs \
      RTD_COMMIT=ec23bc9c9d0eef0821a165d11a3ce75f1f39d59c
  
  # ADD ./sources.list /etc/apt/sources.list
  
  RUN apt-get update && apt-get install -y --no-install-recommends \
          build-essential \
  