Try using __init_subclass__

[simonw]

https://twitter.com/dabeaz/status/1466731368956809219 - David Beazley says:

I think 95% of the problems once solved by a metaclass can be solved by __init_subclass__ instead

[simonw]

Can I use it in place of this?

asyncinject/asyncinject/__init__.py

Lines 17 to 41 in 2a7fca1

	class AsyncInjectMeta(type):
	def __new__(cls, name, bases, attrs):
	# Decorate any items that are 'async def' methods
	_registry = {}
	new_attrs = {"_registry": _registry}
	inject_all = "AsyncInjectAll" in (b.__name__ for b in bases)
	for key, value in attrs.items():
	if inspect.iscoroutinefunction(value) and (
	inject_all or getattr(value, "_inject", None)
	):
	new_attrs[key] = _make_method(value)
	_registry[key] = new_attrs[key]
	else:
	new_attrs[key] = value
	# Gather graph for later dependency resolution
	graph = {
	key: {
	p
	for p in inspect.signature(method).parameters.keys()
	if p != "self" and not p.startswith("_")
	}
	for key, method in _registry.items()
	}
	new_attrs["_graph"] = graph
	return super().__new__(cls, name, bases, new_attrs)