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Like functools.singledispatch but for values

Project description

datadispatch

datadispatch provides a dispatch mechanism (a.k.a. polymorphism) like functools.singledispatch, but it operates on data instead of types. This is useful if you are creating simple data-centric applications where you want polymorphism à la carte without resorting to types or classes.

datadispatch is available through pip: pip install datadispatch

Usage example

from datadispatch import datadispatch

@datadispatch(lambda args, _: args[0].get('type'))
def handle(message):
  raise ValueError('cannot handle message: {}'.format(message))


@handle.register('ping')
def _(message):
  return 'you sent ping'


@handle.register('pong')
def _(message):
  return 'you sent pong'


print(handle(
  {'type': 'ping', 'payload': 'hello'}
))

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