3.2.2.1. Action-like Objects

Action-like objects provide a flexible mechanism for performing custom operations during data processing. Rather than directly reading, writing, or storing a value, actions are defined to modify or interact with the data at various stages of serialization or deserialization.

There are generally two kinds of actions that can be implemented:

object.__action_pack__(self, context)

Invoked when data is serialized. This method can be used for tasks such as calculating checksums, logging..

object.__action_unpack__(self, context)

Invoked when data is deserialized. This method is typically used for validation, verification, or any other operation that should run during unpacking process.

Note

To implement an action-like object, only one of these methods needs to be defined; defining both is optional.

Derived Protocols

class _ActionLike

__action_pack__(self, context: _ContextLike) → None

__action_unpack__(self, context: _ContextLike) → None

class _SupportsActionUnpack

__action_unpack__(self, context: _ContextLike) → None

class _SupportsActionPack

__action_pack__(self, context: _ContextLike) → None