Flexible Python Dataclass Base using Munch

base.py

from munch import Munch

# Validates annotations
# Adding extra fields is allowed
#
# class Foo(Base):
#   a: str
#   b: int
#
# foo = Foo(a="hello", b=42, c=True) # This is OK!
# foo = Foo(a="hi") # raises error


class Base(Munch):
    def __init__(self, **kwargs):
        for key, typ in self.__annotations__.items():
            assert key in kwargs, f'missing field {key}'
            val = kwargs[key]
            assert isinstance(val, typ), f'field {key} of value {val} is not an instance of type {typ}'
        super().__init__(**kwargs)