An iterable Python object.

This is an actual python object. It consists of atyp which is thepython class, and carries some rust payload optionally. This rustpayload can be a rust float or rust int in case of float and int objects.

A reference to a Python object.

Implemented by any type that can be returned from a built-in Python function.

The python item protocol. Mostly applies to dictionaries.Allows getting, setting and deletion of keys-value pairs.

Implemented by any type that can be created from a Python object.

Allows coercion of a types into PyRefs, so that we can write functions that can takerefs, pyobject refs or basic types.

For attributes we do not use a dict, but a hashmap. This is probablyfaster, unordered, and only supports strings as keys.TODO: class attributes should maintain insertion order (use IndexMap here)

ThePyObjectRef is one of the most used types. It is a reference to apython object. A single python object can have multiple references, andthis reference counting is accounted for by this type. Use the.clone()method to create a new reference and increment the amount of referencesto the python object by 1.

Use this type for functions which return a python object or an exception.Both the python object and the python exception arePyObjectRef typessince exceptions are also python objects.