Complex dictionaries to JSON

dict_15_json.py

from datetime import datetime
import json


class PythonObjectEncoder(json.JSONEncoder):
    """PythonObjectEncoder.
    """
    def default(self, an_object_value):
        """default.

        Args:
            an_object_value:
        """

        if isinstance(an_object_value, str):
            return an_object_value

        try:
            iterable = iter(an_object_value)
            return list(iterable)
        except TypeError:
            pass  # this object is not iterable

        if isinstance(an_object_value, datetime):
            return an_object_value.isoformat()

        elif hasattr(an_object_value, "__class__"):
            return str(an_object_value.__dict__)

        return super().default(an_object_value)


def dict_to_json(the_dict: dict) -> str:
    """dict_to_json.

    Args:
        the_dict (dict): the_dict

    Returns:
        str:
    """
    return PythonObjectEncoder().encode(the_dict)


class SimpleClass:
    """simple_class.
    """
    def __init__(self):
        """__init__.
        """
        self.instance_value = 10


b = SimpleClass()

dict1: dict = {}
dict1["string"] = "Hello, World!"
dict1["datetime"] = datetime(2030, 12, 31)
dict1["nothing"] = None
dict1["set"]: set = {0, 1, 2, 3}
dict1["tuple"] = ("apples", "fresh", "green")
dict1["list"] = ["a", "b", "c"]
dict1["simple_class"] = SimpleClass()

assert (
    dict_to_json(dict1) ==
    """{"string": "Hello, World!", "datetime": "2030-12-31T00:00:00", "nothing": null, "set": [0, 1, 2, 3], "tuple": ["apples", "fresh", "green"], "list": ["a", "b", "c"], "user_class": "{'instance_value': 10}"}"""
)