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Showing content from https://github.com/ipython/comm below:

ipython/comm: Python Comm implementation for the Jupyter kernel protocol

It provides a way to register a Kernel Comm implementation, as per the Jupyter kernel protocol. It also provides a base Comm implementation and a default CommManager that can be used.

We provide default implementations for usage in IPython:

import comm


class MyCustomComm(comm.base_comm.BaseComm):
    def publish_msg(self, msg_type, data=None, metadata=None, buffers=None, **keys):
        # TODO implement the logic for sending comm messages through the iopub channel
        pass


comm.create_comm = MyCustomComm

This is typically what ipykernel and JupyterLite's pyolite kernel will do.

import comm

comm.create_comm = custom_create_comm
comm.get_comm_manager = custom_comm_manager_getter

This is typically what xeus-python does (it has its own manager implementation using xeus's C++ messaging logic).

Libraries like ipywidgets can then use the comms implementation that has been registered by the kernel:

from comm import create_comm, get_comm_manager

# Create a comm
comm_manager = get_comm_manager()
comm = create_comm()

comm_manager.register_comm(comm)

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