Python dataclass from a nested dict

Question

The standard library in 3.7 can recursively convert a dataclass into a dict (example from the docs):

from dataclasses import dataclass, asdict
from typing im         


        

Answer 1

I'm the author of dacite - the tool that simplifies creation of data classes from dictionaries.

This library has only one function from_dict - this is a quick example of usage:

from dataclasses import dataclass
from dacite import from_dict

@dataclass
class User:
    name: str
    age: int
    is_active: bool

data = {
    'name': 'john',
    'age': 30,
    'is_active': True,
}

user = from_dict(data_class=User, data=data)

assert user == User(name='john', age=30, is_active=True)

Moreover dacite supports following features:

• nested structures
• (basic) types checking
• optional fields (i.e. typing.Optional)
• unions
• collections
• values casting and transformation
• remapping of fields names

... and it's well tested - 100% code coverage!

To install dacite, simply use pip (or pipenv):

$ pip install dacite