[Vala] How to add Vala generics to PyGObject

[Daniel Espinosa <esodan gmail com>]

I have filed a bug #677960 with the following description:

PyGObject support GLib.List<G> and GLib.Hash<K,V>, but what about Vala/Gee
generics?

How can I create a GLib.List<string> in Python and how can I do the same
for Vala/Gee generics?

May be defining a C API that defines functions that can handle generics and
Python could define the type to use.

Gee's GIR defines lot of interfaces and most of them are Generics.
Particulary when I use:

> > from gi.repository import Gee

works correctly but when try to use the interfaces or just to check it
exists as type I wrote:

> > Gee.List

I get the following error:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.7/dist-packages/gi/module.py", line 243, in
__getattr__
    return getattr(self._introspection_module, name)
  File "/usr/lib/python2.7/dist-packages/gi/module.py", line 180, in
__getattr__
    wrapper = metaclass(name, bases, dict_)
  File "/usr/lib/python2.7/dist-packages/gi/types.py", line 232, in __init__
    register_interface_info(cls.__info__.get_g_type())
TypeError: must be an interface


By inspecting Gee's tree I found that most classes implement and interfaces
have as prerequisite Gee.Traversable, but it is not defined:

> > Gee.Traversable

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.7/dist-packages/gi/module.py", line 243, in
__getattr__
    return getattr(self._introspection_module, name)
  File "/usr/lib/python2.7/dist-packages/gi/module.py", line 105, in
__getattr__
    self.__name__, name))
AttributeError: 'gi.repository.Gee' object has no attribute 'Traversable'



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