from typing import Optional, TypedDict

import typedload

class ExampleTypedDict(TypedDict):
    a: int
    b: Optional[int]

d = {"a": 0}

print(f"{d=}")

td = ExampleTypedDict(**d)

print(f"{td=}")

tdl = typedload.load(d, ExampleTypedDict)

➜  optional_typeddict pipenv run python main.py    
d={'a': 0}
td={'a': 0}
Traceback (most recent call last):
  File "/Users/kkom/Desktop/optional_typeddict/main.py", line 17, in <module>
    tdl = typedload.load(d, ExampleTypedDict)
  File "/Users/kkom/.local/share/virtualenvs/optional_typeddict-hmzsbyx_/lib/python3.9/site-packages/typedload/__init__.py", line 200, in load
    return loader.load(value, type_)
  File "/Users/kkom/.local/share/virtualenvs/optional_typeddict-hmzsbyx_/lib/python3.9/site-packages/typedload/dataloader.py", line 294, in load
    raise e
  File "/Users/kkom/.local/share/virtualenvs/optional_typeddict-hmzsbyx_/lib/python3.9/site-packages/typedload/dataloader.py", line 290, in load
    return cast(T, func(self, value, type_))
  File "/Users/kkom/.local/share/virtualenvs/optional_typeddict-hmzsbyx_/lib/python3.9/site-packages/typedload/dataloader.py", line 500, in _namedtupleload
    raise TypedloadValueError(
typedload.exceptions.TypedloadValueError: Value does not contain fields: {'b'} which are necessary for type ExampleTypedDict
Path: .