Python Dict Tools

dict_tools.py

def update_nested(d, keys, val):
    """Updates a nested dictionary value.

    Args:
        dictionary (dict): The dict we'll be updating
        keys (list): A set of keys pointing to a subvalue of a dict e.g. ['a', 'b'] -> dict['a']['b']
        val: A new value to set at dictionary[key1][key2][..]

    Returns:
        dict: Updated dictionary
    """
    current = d
    for key in keys[:-1]:
        current = current.setdefault(key, {})
    current[keys[-1]] = val
    return d


def set_nested_path(d, path, val):
    keys = path.split(‘.’)
    return set_nested(d, keys, val)


def get_nested(d, keys):
    """Given a dictionary, fetch a key nested several levels deep."""
    head = d
    for k in keys:
        head = head.get(k, {})
        if not head:
            return head
    return head


def get_nested_path(d, path):
    keys = path.split(‘.’)
    return get_nested(d, keys)