Python dataclass from a nested dict

Python dataclass from a nested dict

You can create a Python dataclass from a nested dictionary by defining a dataclass and using a nested dictionary as input to initialize the class. You can then use the @classmethod decorator to create instances from the nested dictionary. Here's an example:

Let's say you have a nested dictionary like this:

data_dict = { 'name': 'John', 'age': 30, 'address': { 'city': 'New York', 'zipcode': '10001' } }

And you want to create a dataclass to represent this data structure:

from dataclasses import dataclass @dataclass class Address: city: str zipcode: str @dataclass class Person: name: str age: int address: Address @classmethod def from_dict(cls, data_dict): address_dict = data_dict.pop('address', None) if address_dict: address = Address(**address_dict) else: address = None return cls(**data_dict, address=address)

You can then create an instance of the Person dataclass using the nested dictionary:

person_instance = Person.from_dict(data_dict) print(person_instance)

This will output:

Person(name='John', age=30, address=Address(city='New York', zipcode='10001'))

In this example, the from_dict class method of the Person dataclass takes care of handling the nested dictionary and initializing the Person and Address instances accordingly.

Examples

  1. "Convert nested dictionary to Python dataclass"

    Description: Learn how to convert a nested dictionary into a Python dataclass to represent structured data with defined types and attributes.

    from dataclasses import dataclass, field from typing import List @dataclass class NestedData: key1: str key2: int @dataclass class MyDataClass: nested: NestedData # Example nested dictionary nested_dict = { 'nested': { 'key1': 'value1', 'key2': 123 } } # Convert nested dictionary to dataclass my_data = MyDataClass(**nested_dict)

  2. "Dataclass from nested dictionary with lists"

    Description: Understand how to create a Python dataclass from a nested dictionary that includes lists as values for certain keys.

    from dataclasses import dataclass from typing import List @dataclass class NestedData: key1: str key2: List[int] @dataclass class MyDataClass: nested: NestedData # Example nested dictionary nested_dict = { 'nested': { 'key1': 'value1', 'key2': [1, 2, 3] } } # Convert nested dictionary to dataclass my_data = MyDataClass(**nested_dict)

  3. "Creating dataclass from nested dictionary with optional fields"

    Description: Explore how to create a Python dataclass from a nested dictionary containing optional fields that may or may not be present.

    from dataclasses import dataclass from typing import Optional @dataclass class NestedData: key1: str key2: Optional[int] @dataclass class MyDataClass: nested: NestedData # Example nested dictionary nested_dict = { 'nested': { 'key1': 'value1' } } # Convert nested dictionary to dataclass my_data = MyDataClass(**nested_dict)

  4. "Nested dictionary to dataclass with default values"

    Description: Learn how to convert a nested dictionary into a Python dataclass with default values for certain attributes.

    from dataclasses import dataclass @dataclass class NestedData: key1: str key2: int = 0 @dataclass class MyDataClass: nested: NestedData # Example nested dictionary nested_dict = { 'nested': { 'key1': 'value1' } } # Convert nested dictionary to dataclass my_data = MyDataClass(**nested_dict)

More Tags

android-x86 android-intent launch qsqlquery android-source xlwings hotkeys lucene gatsby azure-data-factory

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