Multiple dispatch
Project Description
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 http://multiple-dispatch.readthedocs.org/
Example
>>> 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 inheritance
- 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
What this doesn’t do
- Vararg dispatch
@dispatch([int]) def add(*args): ...
- Diagonal dispatch
a = arbitrary_type() @dispatch(a, a) def are_same_type(x, y): return True
Installation and Dependencies
multipledispatch is on the Python Package Index (PyPI):
pip install multipledispatch
or
easy_install multipledispatch
multipledispatch supports Python 2.6+ and Python 3.2+ with a common codebase. It is pure Python and requires no dependencies beyond the standard library.
It is, in short, a light weight dependency.
License
New BSD. See License.
Links
- Five-minute Multimethods in Python by Guido
- multimethods package on PyPI
- singledispatch in Python 3.4’s functools
- Clojure Protocols
- Julia methods docs
- Karpinksi notebook: *The Design Impact of Multiple Dispatch*
- Wikipedia article
- PEP 3124 - *Overloading, Generic Functions, Interfaces, and Adaptation*
Release history Release notifications
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Filename, size & hash SHA256 hash help | File type | Python version | Upload date |
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multipledispatch-0.4.6.tar.gz (7.1 kB) Copy SHA256 hash SHA256 | Source | None | Aug 27, 2014 |