pyo3/pyo3-macros/docs/pyclass_parameters.md

#[pyclass] can be used with the following parameters:

Parameter	Description
crate = "some::path"	Path to import the pyo3 crate, if it's not accessible at ::pyo3.
dict	Gives instances of this class an empty __dict__ to store custom attributes.
extends = BaseType	Use a custom baseclass. Defaults to [PyAny][params-1]
freelist = N	Implements a [free list][params-2] of size N. This can improve performance for types that are often created and deleted in quick succession. Profile your code to see whether freelist is right for you.
module = "module_name"	Python code will see the class as being defined in this module. Defaults to builtins.
name = "python_name"	Sets the name that Python sees this class as. Defaults to the name of the Rust struct.
text_signature = "(arg1, arg2, ...)"	Sets the text signature for the Python class' __new__ method.
subclass	Allows other Python classes and #[pyclass] to inherit from this class. Enums cannot be subclassed.
unsendable	Required if your struct is not [Send][params-3]. Rather than using unsendable, consider implementing your struct in a threadsafe way by e.g. substituting [Rc][params-4] with [Arc][params-5]. By using unsendable, your class will panic when accessed by another thread.
weakref	Allows this class to be [weakly referenceable][params-6].

All of these parameters can either be passed directly on the #[pyclass(...)] annotation, or as one or more accompanying #[pyo3(...)] annotations, e.g.:

// Argument supplied directly to the `#[pyclass]` annotation.
#[pyclass(name = "SomeName", subclass)]
struct MyClass { }

// Argument supplied as a separate annotation.
#[pyclass]
#[pyo3(name = "SomeName", subclass)]
struct MyClass { }