def extend(self, *args: ValidHTTPHeaderSource, **kwargs: str) -> None:
        """Generic import function for any type of header-like object.
        Adapted version of MutableMapping.update in order to insert items
        with self.add instead of self.__setitem__
        """
        if len(args) > 1:
            raise TypeError(
                f"extend() takes at most 1 positional arguments ({len(args)} given)"
            )
        other = args[0] if len(args) >= 1 else ()

        if isinstance(other, HTTPHeaderDict):
            for key, val in other.iteritems():
                self.add(key, val)
        elif isinstance(other, typing.Mapping):
            for key, val in other.items():
                self.add(key, val)
        elif isinstance(other, typing.Iterable):
            other = typing.cast(typing.Iterable[typing.Tuple[str, str]], other)
            for key, value in other:
                self.add(key, value)
        elif hasattr(other, "keys") and hasattr(other, "__getitem__"):
            # THIS IS NOT A TYPESAFE BRANCH
            # In this branch, the object has a `keys` attr but is not a Mapping or any of
            # the other types indicated in the method signature. We do some stuff with
            # it as though it partially implements the Mapping interface, but we're not
            # doing that stuff safely AT ALL.
            for key in other.keys():
                self.add(key, other[key])

        for key, value in kwargs.items():
            self.add(key, value)
Generic import function for any type of header-like object.
        Adapted version of MutableMapping.update in order to insert items
        with self.add instead of self.__setitem__
        
Solutions/CyberArkAudit/Data Connectors/.python_packages/lib/site-packages/urllib3/_collections.py