Contextual binding?

[michael-rubel]

Let's say I have an AbstractFormatter class.

I register the base binding:

self.container.register(AbstractFormatter, JsonFormatter)

class Processor:
    def __init__(
        self,
        json_formatter: AbstractFormatter,
    ):
        self.json_formatter = json_formatter

But one specific class wants another implementation by the same contract:

class CustomProcessor:
    def __init__(
        self,
        markdown_formatter: AbstractFormatter,
    ):
        self.markdown_formatter = markdown_formatter

Now, I want to do the following:

(self.container.when(CustomProcessor)
               .wants(AbstractFormatter)
               .give(MarkdownFormatter))

I.e. only CustomProcessor should receive the markdown formatter.

P.S. Maybe there are other ways to do the same? Inspired by this.

[bobthemighty]

If it makes you feel any better, btw, this one is uncontroversial and - I think - related to #35 .