PRIMITIVE role meaning for Python about python-driver

[juanjux]

I could be wrong, but I think Primitive refers to a language builtin type (like integer, strings, et cetera, that is, not user defined types like classes) not keywords.

The native AST itself doesn't mark if an identifier is built in or not but we could certainly add the Primitive role to Num, String, Byte, Boolean, Set, Dict, List, Tuple and None nodes.

[zurk]

Ok,
So there are two points:

1. Extend the documentation string to be more specific about the role.
2. Add Primitive role to nodes, where it is necessary.
   The last one can be tricky because python has many built-in types (https://docs.python.org/3/library/stdtypes.html), and somewhere we can not check it. So, good idea to specify which types are Primitive for Python.
   For example, as you said

Num, String, Byte, Boolean and None

[juanjux]

Note that I edited my message to add more.

I'm currently adding the primitive role to: Num (which include all numerical types), String, Byte, Boolean, Set, Dict, List and Tuple.

[juanjux]

Fixed by #110.