A relatively sane approach to multiple dispatch in Python.
This implementation of multiple dispatch is efficient, mostly complete, performs static analysis to avoid conflicts, and provides optional namespace support. It looks good too.
See the documentation at https://multiple-dispatch.readthedocs.io/
>>> from multipledispatch import dispatch >>> @dispatch(int, int) ... def add(x, y): ... return x + y >>> @dispatch(object, object) ... def add(x, y): ... return "%s + %s" % (x, y) >>> add(1, 2) 3 >>> add(1, 'hello') '1 + hello'
What this does
Dispatches on all non-keyword arguments
Supports instance methods
Supports union types, e.g. (int, float)
Supports builtin abstract classes, e.g. Iterator, Number, ...
Caches for fast repeated lookup
Identifies possible ambiguities at function definition time
Provides hints to resolve ambiguities when they occur
Supports namespaces with optional keyword arguments
Supports variadic dispatch
What this doesn’t do
a = arbitrary_type() @dispatch(a, a) def are_same_type(x, y): return True
Efficient update: The addition of a new signature requires a full resolve of the whole function. This becomes troublesome after you get to a few hundred type signatures.
Installation and Dependencies
multipledispatch is on the Python Package Index (PyPI):
pip install multipledispatch
multipledispatch supports Python 2.6+ and Python 3.2+ with a common codebase. It is pure Python and requires only the small six library as a dependency.
It is, in short, a light weight dependency.
New BSD. See License file.
Karpinksi notebook: *The Design Impact of Multiple Dispatch*
PEP 3124 - *Overloading, Generic Functions, Interfaces, and Adaptation*
Release history Release notifications | RSS feed
Download the file for your platform. If you're not sure which to choose, learn more about installing packages.
Hashes for multipledispatch-0.6.0-py3-none-any.whl
Hashes for multipledispatch-0.6.0-py2-none-any.whl