noblock.py

"""
https://jupyter.readthedocs.io/en/latest/architecture/how_jupyter_ipython_work.html
http://www.tornadoweb.org/en/stable/
https://jupyter-notebook.readthedocs.io/en/stable/extending/handlers.html
"""
from IPython import get_ipython
from IPython.core.magic import register_cell_magic
from tornado import ioloop
from functools import partial


@register_cell_magic
def noblock(line, cell):
    """ Jupyter Magic to run cell code asynchronously """
    async_loop = ioloop.IOLoop.instance()
    ipy = get_ipython()
    executor = None #  use default
    future = async_loop.run_in_executor(executor, partial(ipy.run_cell, raw_cell=cell))
    future.add_done_callback(alert_done)
    
def alert_done():
    """ Code to execute when the cell finishes running! """
    pass