Data mapping sample

data_mapping_sample.py

# models.py

from dataclasses import dataclass  # Built-in in Python 3.6

@dataclass
class Bar:
    x: int
    y: float

@dataclass
class Root:
    a: str
    b: Bar
    c: int

def map_dict_to_root(data):
    properties = dict()
    for k in data:
        if k == 'b':
            properties[k] = map_dict_to_bar(data[k])
        else:
            properties[k] = data[k]
    return Root(**properties)
    
def map_dict_to_bar(data)
    return data