def validate_is_mapping(option, value):
    if not isinstance(value, collections.Mapping):
        raise TypeError("%s must be an instance of dict, bson.son.SON, or "
                        "other type that inherits from "
                        "collections.Mapping" % (option,))
Key in the config file for this option
dataset/ETHPy150Open mongodb/mongo-python-driver/pymongo/common.py/validate_is_mapping--crossover with--dataset/ETHPy150Open NVIDIA/DIGITS/digits/config/config_option.py/Option.config_file_key