calypso.utils.factory module

class calypso.utils.factory.Factory(factory_name: str, external_entry_group: str = '', lazy=False)

Bases: Mapping[K, Callable[[…], V]], Generic[K, V]

Factory to (lazily optional) store modules and attribute like CLS1=app.pkg.module1:cls1.

Roughly like from app.pkg.module1 import cls1 as CLS1.

• name: name to register in the factory, refer to CLS1

• module_attr_name: name of the module and attribute split by :, refer to app.pkg.module1:cls1

• factory_name: name of this factory

• external_entry_group: group name for external module

Examples

>>> Array = Factory("myfactory", external_entry_group="")
>>> Array.register(module_attr_name="numpy:array", name="nparray")
>>> Array["nparray"]([1, 2])
array([1, 2])

register(module_attr_name, name, force=False)

Register a virtual subclass of an ABC.

Returns the subclass, to allow usage as a class decorator.