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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def add_preceding_dict(config_entry, query_path, preceding_depth):
 """ Adds the preceeding config keys to the config_entry to simulate the original full path to the config entry :param config_entry: object, the entry that was requested and returned from the config :param query_path: (str, list(str)), the original path to the config_entry :param preceding_depth: int, the depth to which we are recreating the preceding config keys :return: dict, simulated config to n * preceding_depth """

        if preceding_depth is None:
            return config_entry

        preceding_dict = {query_path[-1]: config_entry}
        path_length_minus_query_pos = len(query_path) - 1
        preceding_depth = path_length_minus_query_pos - preceding_depth if preceding_depth != -1 else 0

        for index in reversed(range(preceding_depth, path_length_minus_query_pos)):
            preceding_dict = {query_path[index]: preceding_dict}

        return preceding_dict