Inlet

To be able to process the input from inlets, you must define methods for each inlet using its index followed by uts selector. If you don't know what is selectors in Pd enviroment, check PureData Documentation Chapter 2.4.1.

Inlet creation

You must define the numbers of inlets in the self.__init__, you must especify this number, even when it is 0.

def __init__(self, args):
    self.inlets = 4 # 4 inlets
    self.outlets = 1 # 1 outlet
    self.gain = 1.0

Selectors

Selector	Method signature
bang	in_N_bang(self)
float	in_N_float(self, f)
symbol	in_N_symbol(self, s)
list	in_N_list(self, xs)
Custom	in_N_custom(self, *args)
pyobj	in_N_pyobj(self, obj)

Dynamic inlet creation

For some object, can be necessary to create methods in a dynamic way.

class pyappend(pd.NewObject):
    name = "py.append"

    def __init__(self, args):
        self.inlets = int(args[0]) if args else 2
        self.outlets = 1
        self.dict = {}
        for i in range(1, self.inlets + 1):
            self._add_inlet(i)

    def _add_inlet(self, idx):
        def handler(args, idx=idx):
            self.dict[idx] = args if type(args) == list else [args]
            if idx == 1:
                output = []
                for i in range(1, self.inlets + 1):
                    output.extend(self.dict.get(i, []))
                self.out(0, pd.PYOBJECT, output)

        for sel in ['list', 'float', 'symbol', 'pyobj']:
            setattr(self, f"in_{idx}_{sel}", handler)