Python got multiple values for argument

I have an object, with a Dependency Injection field for objects implementing method provide():

class DataContainer():

    PROVIDERS = dict()

    def __init__(self):
        self.provider = None

    def provide(self, *args, **kwargs):
        if self.provider:
            return self.provider.provide(self, *args, **kwargs)
        raise KeyError("No provider selected")

I wrote a custom Provider object for it as follows:

# INTERFACE:

class Provider(ABC):
    @abstractmethod
    def provide(self, *args, **kwargs):
        pass

    @abstractmethod
    def add_product(self, name: str, product: ProviderProduct, *args, **kwargs) -> None:
        pass

    @abstractmethod
    def remove_product(self, name: str, *args, **kwargs) -> None:
        pass

class ProviderProduct(ABC):
    @abstractmethod
    def configure(self, *args, **kwargs) -> ProviderProduct:
        pass


IMPLEMENTATION:

class TestProvider(Provider):
    REGISTERED = dict()

    def provide(self, product, from_dict, *args, **kwargs):
        if product in TestProvider.REGISTERED:
            return TestProvider.REGISTERED[product].configure(from_dict)
        raise KeyError("{} not in REGISTERED".format(product))

class AbstractTestProduct(ProviderProduct, ABC):
    INDEX = [0]
    COLUMNS = list()

    def configure(self, from_dict: Dict) -> ProviderProduct:
        df = pd.DataFrame(index=self.INDEX, columns=self.COLUMNS)
        df.update(from_dict)
        return df

    def add_product(self, name, product):
        if isinstance(product, AbstractTestProduct):
            TestProvider.REGISTERED[name] = product
        else:
            raise ValueError("Given {} class is not of AbstractTestProduct type".format(product.__class__.__name__))

    def remove_product(self, name):
        if name in TestProvider.REGISTERED.keys():
            del TestProvider.REGISTERED[name]
        else:
            raise KeyError("{} not found in registered list".format(name))

Now, when I wrote some unit tests for it, things go wrong:

class TestProviderTestSuite(unittest.TestCase):

    @classmethod
    def setUpClass(cls):
        class TestProviderProduct1(AbstractTestProduct):
            COLUMNS = ['test_col_1_1', 'test_col_1_2', 'test_col_1_3']

        class TestProviderProduct2(AbstractTestProduct):
            COLUMNS = ['test_col_2_1', 'test_col_2_2', 'test_col_2_3', 'test_col_2_4']

        class TestProviderProduct3(AbstractTestProduct):
            COLUMNS = ['test_col_3_1', 'test_col_3_2', 'test_col_3_3', 'test_col_3_4', 'test_col_3_5']
        
        cls.data_container = DataContainer()
        cls.data_container.register_provider("dataframe", TestProvider())
        cls.data_container.change_provider('dataframe')
        cls.data_container.add_provider_product("a", TestProviderProduct1())
        cls.data_container.add_provider_product("b", TestProviderProduct2())
        cls.data_container.add_provider_product("c", TestProviderProduct3())

    def test_should_provide_empty_product_df_a(self):
        # Given
        # -
        
        # When
        product_df_a = self.data_container.provide(product="a")

        # Then
        self.assertEqual(3, len(product_df_a.columns))
        self.assertEqual(1, len(product_df_a.index))
        self.assertTrue(0 in product_df_a.index)
        self.assertTrue(product_df_a.isnull().all(axis='columns').values[0])

I get the following error for the test above:

self = <utils.providers.test_provider.TestProviderTestSuite testMethod=test_should_provide_empty_product_df_a>

    def test_should_provide_empty_product_df_a(self):
        # Given
        # -
    
        # When
>       product_df_a = self.data_container.provide(product="a")

tests\test_provider.py:43: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = <DataContainer.DataContainer object at 0x0000022FF859CB48>, args = (), kwargs = {'product': 'a'}

    def provide(self, *args, **kwargs):
        if self.provider:
>           return self.provider.provide(self, *args, **kwargs)
E           TypeError: provide() got multiple values for argument 'product'

I don`t understand why interpreter, when it receives a call to DataContainer's method .provide(product="a") determines that 'product' keyworded argument is passed twice.

Any ideas?

This is happening on Python 3.7 for me.