CODEWITHSUNDEEP
pythonpython-3.xclassarguments
Cos_ma
Cos_ma

Reputation: 75

How to make a class initializable with both positional and keyword arguments

I am trying to make a class which allows for initalization with either default values for arguments, or with the values passed to it. Furthermore, I want to be able to pass those arguments either as positional or as keyworded ones. It works with keyworded arguments, however, when I try creating it like foo = Foo(3) with any number of positional arguments provided I get a TypeError: __init__() takes 1 positional argument but 2 were given

class Foo:
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        args_list = OrderedDict()
        args_list.update(x=1,
                        y=2,
                        z=3)
        args_list.update(kwargs)

        iter_args_list = enumerate(args_list)
        for positional_arg in args:
            (_, key_value) = next(iter_args_list)
            args_list[key_value] = positional_arg

        for argument_key, argument_value in args_list.items():
          setattr(self, argument_key, argument_value)

Upvotes: 2

Views: 201

Answers (1)

willeM_ Van Onsem
willeM_ Van Onsem

Reputation: 476594

The problem is probably that you pass the args and kwargs to the super() and object does not like that since the object does not take (named or unnamed) parameters. So you should rewrite:

class Foo:
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        # ...

to:

class Foo:
    def __init__(self, *args, **kwargs):
        super().__init__()
        # ...

Upvotes: 2

Related Questions