Background ZMQ IPython/Jupyter kernel
Run some IPython ZMQ kernel in the background, without an interactive shell. You can connect to that kernel remotely via ZMQ.
Installation (package is on PyPI):
pip install background_zmq_ipython
import background_zmq_ipython background_zmq_ipython.init_ipython_kernel()
The kernel will then run in the background in its own thread. The init will print some message similar to this on stdout:
To connect another client to this IPython kernel, use: jupyter console --existing kernel-1111.json
Now, after you connected, how to access globals from the main module? E.g. let’s say there is a variable a.
sys.modules["__main__"].a should work. Via sys.modules, you can access all the imported modules. Or just do import mod again.
Get the stack of all/other frames via sys._current_frames(), and there you can access the globals from other threads as well.
You can provide user_ns to init_ipython_kernel, e.g:
Alternatives / related links:
- Twisted SSH (example code)
- IPython.embed_kernel in a background thread (example code). This has some issues (e.g. here; messing around with sys.stdout etc).
- This code was introduced in this StackOverflow question, and also discussed in this IPython GitHub issue #8097, but it has become outdated, so this project provides a rewrite / updated code, and the goal was also an easy to install pip package.
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