Type hints support for autowiring

[dbalabka]

Does Pinject use class constructor arguments' type hints information (e.g. using inspect module) to find appropriate class object to be injected?

[benvdh]

@dbalabka from both experience and the docs, I can tell this is not the case. As the readme states in the 'condensed summary' section:

Bindings are keyed by arg name, (not class type, since Python is dynamically typed).

So that would be the constructor argument names, rather than the type hints, which tend to refer to classes or types.

[dbalabka]

@benvdh thanks! My question is mostly like feature request.
IMO if library relies on arguments names then it mean that each names should be manually bind to some particular instance (unless you are following some convention). If argument’s type hint is used (which are already exists in code) then you already have enough meta information to bind some this argument to some particular class (unless you are not using interfaces for type hinting).

Of course arguments names are still useful in autowiring when we have multiple instances of some particular class (e.g., HTTP client with different host configuration) or we want to bind some scalar value (e.g., configuration parameter). But it is more rare cases. Type hints cover most of the cases for autowiring, that I’m wondering do this library supports autowiring by Python’s type hints.

Ideally, I would like to get solution that might be close to Symfony’s (PHP) autowiring approach which uses types, arguments names and also provides possibility to manually describe dependencies.

Currently, I started to use https://github.com/ivankorobkov/python-inject which supports autowiring by type hints.