anchor.diff: -
   # FROM directive instructing base image to build upon
   FROM centos:7
   
  
positive.code: 
  # Install any needed packages specified in requirements.txt
  RUN pip install -r requirements.txt
  
  # Clean all installed packages
  RUN yum clean all
  
negative.code: # EXPOSE port 80 to allow communication to/from server
  EXPOSE 80
  
  # Specifcies the entrypoint to start the Apache server.
  ENTRYPOINT ["/usr/sbin/httpd", "-D", "FOREGROUND"]