[Tutor] [newbie] import error after restart (virtualenv)

Sat Sep 19 15:22:28 CEST 2015

Dear Tutors,

I am reading through Harry Percival's "Test-Driven Development with
Python".

As I finished chapter 3 yesterday, I was fully on track, perfectly
aligned with the book.

Today I restarted my computer, activated the virtualenv in question --
and get an error message that was not there beforehand:

(Percival_TDD)david at lubuntu:~/PycharmProjects/Percival_TDD/superlists/lists$
python tests.py
Traceback (most recent call last):
  File "tests.py", line 5, in <module>
    from lists.views import home_page
ImportError: No module named 'lists'

I neither understand why he doesn't find 'lists' anymore nor do I know
how to solve the problem. Nothing seems to have changed in the meantime...

Can you please guide me towards a solution?

Thank you!

David

The project structure looks as follows:

(Percival_TDD)david at lubuntu:~/PycharmProjects/Percival_TDD/superlists$ tree
.
├── db.sqlite3
├── functional_tests.py
├── lists
│   ├── admin.py
│   ├── __init__.py
│   ├── migrations
│   │   └── __init__.py
│   ├── models.py
│   ├── tests.py
│   └── views.py
├── manage.py
└── superlists
    ├── __init__.py
    ├── __pycache__
    │   ├── __init__.cpython-34.pyc
    │   ├── settings.cpython-34.pyc
    │   ├── urls.cpython-34.pyc
    │   └── wsgi.cpython-34.pyc
    ├── settings.py
    ├── urls.py
    └── wsgi.py

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views.py

from django.shortcuts import render
from django.http import HttpResponse

# Create your views here.
def home_page(request):
    return HttpResponse('<html><title>To-Do lists</title></html>')

tests.py

from django.core.urlresolvers import resolve
from django.test import TestCase
from django.http import HttpRequest

from lists.views import home_page

class HomePageTest(TestCase):

    def test_root_url_resolves_to_home_page_view(self):
        found = resolve('/')
        self.assertEqual(found.func, home_page)

    def test_home_page_returns_correct_html(self):
        request = HttpRequest()
        response = home_page(request)
        self.assertTrue(response.content.startswith(b'<html>'))
        self.assertIn(b'<title>To-Do lists</title>', response.content)
        self.assertTrue(response.content.endswith(b'</html>'))