I am having trouble with the Jinja2 templates and the routing and URLs tutorials.

When I follow your code and use:

from pypi_org.infrastructure.view_modifiers import response
import pypi_org.services.package_service as package_service

I get the error:
ModuleNotFoundError: No module named 'pypi_org'

The error doesn't occur when I change the code to:

from infrastructure.view_modifiers import response
import services.package_service as package_service

What am I doing wrong?