I'm trying to setup a LinkColumn and I've seen in the examples that a the args parameter has usually the form args=[A('pk')]. I'm wondering what is the meaning of the A().
From the documentation of django-tables, A is the Accessor Class.
A string describing a path from one object to another via attribute/index accesses. For convenience, the class has an alias A to allow for more concise code.
Relations are separated by a . character.
So basically you are using the primary key in this example to access the objects.