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

You can use mashumaro for creating dataclass object from a dict according to the scheme. Mixin from this library adds convenient from_dict and to_dict methods to dataclasses:

from dataclasses import dataclass
from typing import List
from mashumaro import DataClassDictMixin

@dataclass
class Point(DataClassDictMixin):
     x: int
     y: int

@dataclass
class C(DataClassDictMixin):
     mylist: List[Point]

p = Point(10, 20)
tmp = {'x': 10, 'y': 20}
assert p.to_dict() == tmp
assert Point.from_dict(tmp) == p

c = C([Point(0, 0), Point(10, 4)])
tmp = {'mylist': [{'x': 0, 'y': 0}, {'x': 10, 'y': 4}]}
assert c.to_dict() == tmp
assert C.from_dict(tmp) == c