CODEWITHSUNDEEP
python-3.xpython-dataclasses
Jorvis
Jorvis

Reputation: 3209

Getting __init__() missing required positional arguments when using a dataclass

I know the init method is built automatically when creating a dataclass, but when I try this definition:

@dataclass
class LayoutCollection:
    root_folder_idx: dict = field(repr=False)
    folder_idx: dict = field(repr=False)
    layouts: List[Layout] = field(default_factory=list)

    def __post_init__(self):
        if len(self.folder_idx) == 0:
            self._populate_folder_index()
            self._populate_root_folder_index()
    
    def __repr__(self):
        return json.dumps(self.__dict__)

Anytime I run this code I get:

TypeError: __init__() missing 2 required positional arguments: 'root_folder_idx' and 'folder_idx'

If I re-order the arguments such that the layouts: attribute is first, I get:

TypeError: non-default argument 'root_folder_idx' follows default argument

I'm just trying to make it so that layouts initializes as a list of Layout objects, while the other two initialize as dict() but aren't represented during repr

Upvotes: 1

Views: 1659

Answers (1)

Jorvis
Jorvis

Reputation: 3209

Of course, right when I ask I figure it out.

On both of the attributes I wanted to initialize as dictionaries I needed to add default_factory defs, like this:

root_folder_idx: dict = field(default_factory=dict, repr=False)

Upvotes: 2

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