Example class for a strange problem passing **kwargs to a class init function, when other args are passed as keywords too.

test-dict-similar.py

"""
Example class for a strange problem passing **kwargs to a class init function, when other args are passed as keywords too.

DictSimilar behaves as a wrapper around dict, to provide an object for dict structures.

Works in CPython 3.10.8

Does NOT work in Pypy:
  Python 3.9.12 (05fbe3aa5b0845e6c37239768aa455451aa5faba, Mar 29 2022, 08:15:34)
  [PyPy 7.3.9 with GCC 10.2.1 20210130 (Red Hat 10.2.1-11)]
  
Also discussed in:
https://github.com/ansible-collections/kubernetes.core/issues/447
"""

class DictSimilar():
    """
    Minimal test class, based on ResourceField from kubernetes.base.dynamic.resource

    https://github.com/kubernetes-client/python/blob/master/kubernetes/base/dynamic/resource.py
    """

    def __init__(self, params):
        self.__dict__.update(**params)

    def __getitem__(self, name):
        return self.__dict__.get(name)

    def __getattr__(self, name):
        return self.__dict__.get(name, getattr(self.__dict__, name, None))

    def __setattr__(self, name, value):
        self.__dict__[name] = value

    def __iter__(self):
        for k, v in self.__dict__.items():
            yield (k, v)


class TestObject():
    def __init__(self, irrelevant=None, **kwargs):
        print(kwargs)


d = DictSimilar({
    "a": 1234,
    "b": "4567",
    "c": True
})

# Works even in Pypy
TestObject(**d)
TestObject(False, **d)

# Workaround of course
TestObject(irrelevant=False, **d.__dict__)

# Does not work in Pypy...
TestObject(irrelevant=False, **d)