static_output.py 文件源码

def __new__(cls, filename=None, *args, **kwargs):
        if not isinstance(filename, string_types):
            obj = object.__new__(cls)
            # The Stream frontend uses a StreamHandler object to pass metadata
            # to __init__.
            is_stream = (hasattr(filename, 'get_fields') and
                         hasattr(filename, 'get_particle_type'))
            if not is_stream:
                obj.__init__(filename, *args, **kwargs)
            return obj
        apath = os.path.abspath(filename)
        cache_key = (apath, cPickle.dumps(args), cPickle.dumps(kwargs))
        if ytcfg.getboolean("yt","skip_dataset_cache"):
            obj = object.__new__(cls)
        elif cache_key not in _cached_datasets:
            obj = object.__new__(cls)
            if obj._skip_cache is False:
                _cached_datasets[cache_key] = obj
        else:
            obj = _cached_datasets[cache_key]
        return obj