dialogue.multi-method

A small library to provide multi-methods. All functions are in the dialogue.multi_method package.

To create a multi-method, create a dispatch function, that takes the arguments and returns a hashable value, that is used to dispatch on. Use the @multi function annotation to annotate the function.

For each value of the dispatch function that you want to be handled differently, create a method with that dispatch value.

You can define a method with no dispatch value, that becomes the default method if no other method is defined for a dispatch value.

An example:

@multi
def number(x):
  return x


@method(number, 1)
def number_one(x):
  return 'one'


@method(number)
def number_other(x):
  return "not one, but "+ str(c)


assert number(1) == 'one'
assert number(0) == 'not one, but 0'

The dispatch function is available, e.g. for testing:

assert dispatch_fn(number)('x') == 'x'