coding standards

Django Models:

• Foreign keys appear at the top of models
• single quote ' is preferred to double " which should only be used for block comments
• Models of a single app should stay in one file
• Models should not contain business logic (use services for this)
• Explicitly declare the function or class you import (not xx.Foo, but from xx import Foo)
• Always use absolute paths for imports
• Class properties should only be declared in class constructor, unless static properties or constants

PEP-8 with the following exceptions:

• Max line length is 100