def concat_step_infos(step_info_list):
    """We only conduct simply shallow update here!"""
    old_dict = dict()
    for new_dict in step_info_list:
        old_dict = merge_dicts(old_dict, new_dict, allow_new_keys=True, without_copy=True)
    return old_dict
We only conduct simply shallow update here!
metadrive/utils/utils.py