Creating nested dataclass objects in Python

Question

I have a dataclass object that has nested dataclass objects in it. However, when I create the main object, the nested objects turn into a dictionary:

@datacl         


        

Answer 1

You can try dacite module. This package simplifies creation of data classes from dictionaries - it also supports nested structures.

Example:

from dataclasses import dataclass
from dacite import from_dict

@dataclass
class A:
    x: str
    y: int

@dataclass
class B:
    a: A

data = {
    'a': {
        'x': 'test',
        'y': 1,
    }
}

result = from_dict(data_class=B, data=data)

assert result == B(a=A(x='test', y=1))

To install dacite, simply use pip:

$ pip install dacite