using yaml_constructors attribute of the Loader class

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Hi.

In a framework I'm writing I have a custom YAML Loader, with several
custom constructors.

Now, I would like to allow applications to define their own
constructors, and have them be used by my framework.

Using setuptools entry points, the code is something like this:


from pkg_resources import iter_entry_points
from yaml.loader import Loader

class MyLoader(Loader):
    def factory(cls)
        yaml_constructors = cls.yaml_constructors
        for ep in iter_entry_points('my.entrypoint'):
            yl = ep.load()

            yaml_constructors.update(yl.yaml_constructors)

        d = dict(yaml_constructors=yaml_constructors)
        return type('MyLoader', (cls,), d)

Applications just need to create a custom loader class, derived from
yaml.loader.Loader, and register their own constructors.

Is it "safe" (that is, is the API stable) to access the
yaml_constructors attribute of the Loader class?



Thanks  Manlio Perillo
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