Accessing dict value with all keys in one string

dynamic_access_dict.py

class DynamicAccessDict(dict):
    """
    A dict-like class that allows accessing LineCol object with multi-level keys in a list
    Example:
        config == {
            'a': {
                'b': 0,  # int value
                'c': [{'d': 3}]  # list value
            }
        }

        d = DynamicAccessLineColDict(config)

        # Get a config value with a list of parameters
        d.get_by_keys(['a', 'b'])  # 0

        # Get a list value with a list of parameters and indexes
        d.get_by_keys(['a', 'c', 0, 'd'])  # 3
        
        # Check if a key-value pair exists with given list of keys
        d.key_exists(['a', 'a'])  # False
    """

    def get_by_keys(self, keys: Sequence):
        return reduce(operator.getitem, keys, self)

    def set_by_keys(self, keys: Sequence, val) -> None:
        reduce(lambda d, k: d.setdefault(k, {}), keys[:-1], self)[keys[-1]] = val

    def has_keys(self, keys: Sequence) -> bool:
        try:
            reduce(operator.getitem, keys, self)
            return True
        except (KeyError, TypeError):
            return False