7.2.6.16. DFun

class DFun(out, fun, inputs=None, **kwds)

A 3-tuple (out, fun, **kwds), used to prepare a list of calls to Dispatcher.add_function().

The workhorse is the addme() which delegates to Dispatcher.add_function():

• out: a scalar string or a string-list that, sent as output arg,

• fun: a callable, sent as function args,

• kwds: any keywords of Dispatcher.add_function().

• Specifically for the ‘inputs’ argument, if present in kwds, use them (a scalar-string or string-list type, possibly empty), else inspect function; in any case wrap the result in a tuple (if not already a list-type).

  Note

  Inspection works only for regular args, no *args, **kwds supported, and they will fail late, on addme(), if no input or inp defined.

Example:

>>> dfuns = [
...     DFun('res', lambda num: num * 2),
...     DFun('res2', lambda num, num2: num + num2, weight=30),
...     DFun(out=['nargs', 'res22'],
...          fun=lambda *args: (len(args), args),
...          inputs=('res', 'res1')
...     )]
>>> dfuns
[DFun('res', <function <lambda> at 0x...>, ),
 DFun('res2', <function <lambda> at 0x...>, weight=30),
 DFun(['nargs', 'res22'], <function <lambda> at 0x...>,
      inputs=('res', 'res1'))]
>>> from schedula import Dispatcher
>>> dsp = Dispatcher()
>>> DFun.add_dfuns(dfuns, dsp)

Methods

__init__	Initialize self.
add_dfuns
addme
copy
inspect_inputs

__init__(out, fun, inputs=None, **kwds)

Initialize self. See help(type(self)) for accurate signature.