Multiple dispatch in SymPy

[Francesco Bonazzi]

Hi,

are there any actual intentions of ever introducing multiple dispatch support to SymPy? Has the idea been completely abandoned?

I would like to have it as a dependency, some SymPy code could be made much more readable with it.

For those who are unfamiliar with the topic, some time ago we had this library developed for the purpose:

http://multiple-dispatch.readthedocs.io/en/latest/

https://github.com/mrocklin/multipledispatch

[Aaron Meurer]

What code specifically do you want to use it in?

In my experience, dispatching in SymPy functions happens by expression
type, which is often reflected by Python class, but not always. A
pattern matching based dispatching system would be more useful in my
opinion.

Aaron Meurer

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[Francesco Bonazzi]

I was mulling over the possibility of adding support for series expansion of indexed objects and/or multivariate series.

The _eval_nseries method could be dispatched over its second argument (second means the one after self).

The alternative would be the classical if isinstance( ... ), which SymPy is full of. In this case, it would be necessary to rewrite almost all of the _eval_nseries around.

[Aaron Meurer]

If it's the same logic in every function, it should be put in the main
series() method that calls _eval_nseries.

Aaron Meurer

> https://groups.google.com/d/msgid/sympy/c59ee0a6-df47-4095-9f7c-46eb83d3327d%40googlegroups.com.