Check if registered entry point is available for a given name in the namespace and load it. Otherwise, return the default value.

Cataloguepronunciation

The registry object that can be used to register and retrieve functions. It's usually created internally when you call catalogue.create.

Let's imagine you're developing a Python package that needs to load data somewhere. You've already implemented some loader functions for the most common data types, but you want to allow the user to easily add their own. Using catalogue.create you can create a new registry under the namespace your_package → loaders.

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Catalogueor catalog

Find the information about a registered function, including the module and path to the file it's defined in, the line number and the docstring, if available.

CataloguePDF

The decorated function will be registered automatically and in your package, you'll be able to access all loaders by calling loaders.get_all.

For instance, in spaCy we're starting to use function registries to make the pipeline components much more customizable. Let's say one user, Jo, develops a better tagging model using new machine learning research. End-users of Jo's package should be able to write spacy.load("jo_tagging_model"). They shouldn't need to remember to write import jos_tagged_model first, just to run the function registries as a side-effect. With entry points, the registration happens at install time – so you don't need to rely on the import side-effects.

Register a function in the registry's namespace. Can be used as a decorator or called as a function with the func keyword argument supplying the function to register.

Cataloguedesign

Register a function in the registry's namespace. Can be used as a decorator or called as a function with the func keyword argument supplying the function to register. Delegates to Registry.register.

Cataloguemeaning in Hindi

Initialize a new registry. If entry_points=True is set, the registry will check for Python entry points advertised for the given namespace, e.g. the entry point group spacy_architectures for the namespace "spacy", "architectures", in Registry.get and Registry.get_all.

Cataloguemeaning in Urdu

Get registered entry points from other packages for this namespace. The name of the entry point group is the namespace joined by _.

The user can now refer to their custom loader using only its string name ("custom_loader") and your application will know what to do and will use their custom function.

Sure, that's the more classic callback approach. Instead of a string ID, load_data could also take a function, in which case you wouldn't need a package like this. catalogue helps you when you need to produce a serializable record of which functions were passed in. For instance, you might want to write a log message, or save a config to load back your object later. With catalogue, your functions can be parameterized by strings, so logging and serialization remains easy – while still giving you full extensibility.

Decorators normally run when modules are imported. Relying on this side-effect can sometimes lead to confusion, especially if there's no other reason the module would be imported. One solution is to use entry points.

catalogue is a tiny, zero-dependencies library that makes it easy to add function (or object) registries to your code. Function registries are helpful when you have objects that need to be both easily serializable and fully customizable. Instead of passing a function into your object, you pass in an identifier name, which the object can use to lookup the function from the registry. This makes the object easy to serialize, because the name is a simple string. If you instead saved the function, you'd have to use Pickle for serialization, which has many drawbacks.

Create a new registry for a given namespace. Returns a setter function that can be used as a decorator or called with a name and func keyword argument. If entry_points=True is set, the registry will check for Python entry points advertised for the given namespace, e.g. the entry point group spacy_architectures for the namespace "spacy", "architectures", in Registry.get and Registry.get_all. This allows other packages to auto-register functions.