utils.py 文件源码

def def_itemgetter(attr, default=0, _type=None):
    # like operator.itemgetter but fills in missing keys with a default value
    def keyfunc(item):
        value = item.get(attr, default)
        casted = cast(value, _type) if _type else value

        try:
            is_nan = isnan(casted)
        except TypeError:
            is_nan = False

        return default if is_nan else casted

    return keyfunc


# TODO: move this to meza.process.group