小编tin*_*rer的帖子

我是Numpy的ndarray类的子类,添加了一些元数据和其他方法.我试图按照指示这篇文章和那一个.但是,一些Numpy(或Scipy)函数返回基类"ndarray"而不是我的自定义子类.其他Numpy函数返回我的子类,我不知道差异的原因是什么.如何让所有numpy/scipy函数返回我的子类？这就是我做的:

class Signal(np.ndarray):
    def __new__(cls, filename):
        #print "In __new__" #TEMP DEBUG
        ret = np.fromfile(filename, dtype = np.int32)
        ret = ret.view(cls) # convert to my class, i.e. Signal
        ret.parse_filename(filename)
        return ret

    def __array_finalize__(self, obj):
        #print "in __array_finalize__" #TEMP DEBUG
        if obj is None: return # shouldn't actually happen.
        # copy meta-fields from source, if it has them (otherwise put None's)
        self.filename = getattr(obj, "filename", None)
        self.folder = getattr(obj, "folder", None)
        self.label = getattr(obj, "label", None)
        self.date = …