stackoverflow上没人回答，请教V2EXer~~~关于django的包管理

I generate a django project and its directory structure is like the following:

-myproject

--__init__.py

--settings.py

--rooturls.py

--dbUtils.py

--app1

---__init__.py

---views.py

---urls.py

--app2

---__init__.py

---views.py

---urls.py
I want to import dbUtils in my apps , so I configure in my settings.py:

PROJECT_ROOT = os.path.dirname(__file__)
sys.path.insert(0, PROJECT_ROOT)
However, the program still can't find the moudle.