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multipledispatch 0.4.0

Multiple dispatch

Latest Version: 0.4.8

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


>>> 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)

>>> 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
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


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.


New BSD. See License.

File Type Py Version Uploaded on Size
multipledispatch-0.4.0.tar.gz (md5) Source 2014-03-28 5KB
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