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Serialize and deserialize python object to JSON and back

Project description


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SoKu is small library for serialize and deserialize python object to JSON and back. This library is useful for conversation between micro services, see example. It can to serialize from object and back, validate when deserialize and use custom deserializer and serializer.


pip install soku


from datetime import datetime
from dataclasses import dataclass
from soku import Class, Attribute

def is_int(_, value):  # validator must be callable and return bool or raise exception
    return isinstance(value, int)

def timestamp_to_date(value):
    return datetime.fromtimestamp(value)

def date_to_timestamp(value):
    return int(value.timestamp())

class FullName(Class):
    first_name: str = Attribute(key='firstName')
    last_name: str = Attribute(key='lastName')

    def full_name(self):
        return f'{self.first_name} {self.last_name}'

class Person(Class):
    id: int = Attribute(validate=is_int)
    full_name: FullName = Attribute(key='fullName', attach=FullName)

class User(Person):
    birthday: datetime = Attribute(deserialize=timestamp_to_date, serialize=date_to_timestamp)

if __name__ == '__main__':
    # create instance and serialize
    full_name = FullName('John', 'Smith')
    user = User(12345, full_name, datetime.fromtimestamp(1193875200))
    print(user.serialize())  #  {'id': 12345, 'birthday': 1193875200, 'fullName': {'firstName': 'John', 'lastName': 'Smith'}}

    # deserialize and serialize
    user = User.deserialize({'id': 12345, 'birthday': 1193875200, 'fullName': {'firstName': 'John', 'lastName': 'Smith'}})
    print(user.full_name.full_name())  # John Smith
    print(user.serialize())  # {'id': 12345, 'birthday': 1193875200, 'fullName': {'firstName': 'John', 'lastName': 'Smith'}}

    # validate
        User.deserialize({'id': '12345', 'birthday': 1193875200, 'fullName': {'firstName': 'John', 'lastName': 'Smith'}})
    except ValueError as exc:
        print(exc)  # Key id validation error.

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