This Engineering Notebook post discusses integrating Leo with IPython.
Similar remarks apply to Jupyter and SageMath.
To summarize: *thought experiments doom all such projects.*
*Bypass IPython's event loop?*
Suppose Leo avoids creating IPython's event loop. Doing so would avoid
hanging Leo when accessing IPython's features. This idea implies bypassing
IPython's repl.
*Bypass IPython's repl?*
Suppose Leo provides IPython's features by accessing them via IPython's
API. However, experiments (and a review of IPython's code) show that
IPython's features require IPython's repl!
Indeed, IPython's *BaseIPythonApplication *class contains this description:
"IPython: an enhanced interactive Python shell."
*Create a bespoke client-server architecture?*
Suppose Leo accesses IPython's features by accessing a running instance of
IPython via a client-server architecture. Leo would be the client. It would
be straightforward to start this server when IPython starts.
But what, exactly, would Leo ask IPython to do? And why would anyone care?
There seems to be no answers to this question!
*Conclusion*
The thought experiments presented here suggest that Leo gains nothing by
attempting to work closely with IPython. There are no scenarios in which
Leo gains from accessing IPython's features from within Leo.
This surprising conclusion is good news. It's always good to abandon
mistaken ideas!
After clearing our heads, we can see that this conclusion makes sense. Leo
needs no help from IPython and vice versa. Why did we ever think otherwise?
*Summary*
Leo's IPython integration does not work and probably has not worked for
years. Yet nobody seems to have noticed!
Integrating Leo and IPython presents insurmountable problems. All attempts
would likely be complex and fragile, as indeed leoIPython.py has proven to
be.
Leo gains nothing by attempting to work closely with IPython. All recent
comments from Leonistas support this conclusion.
Unless I hear convincing counter-arguments, a new PR (scheduled for 6.8.2)
will remove leoIPython.py and Leo's valuespace plugin. There will be no
need to add IPython or Jupyter to Leo's requirements.
All your comments and questions are welcome. There is plenty of time for
further discussion.
Edward
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