bagof-core-magic

Core tools used by magic converters, validators, factories, etc.

It provides the type-hint introspection machinery shared by those packages - functions such as issubhint, ishintstance, unwrap, and get_default for inspecting and comparing typing hints at runtime - along with the MagicHint base class and MagicError exception that magic objects are built on.

It also lets registries (the dicts get_from_registry searches) be keyed lazily: defer(registry, ForwardRef("dask.array.Array"), value, context) registers value once someone else has imported dask.array, without ever importing it - so a package can register values for optional libraries without paying their import time. lazy_import and has_module help define such classes without importing the library.