初学Python，不理解后面定义的方法中return实例属性为什么还带括号
比如说feature_extractor的x是怎么作用于实例属性features的，或者说，这样的语句是啥意思
按我理解这个属性不就是一个值吗？怎么还能带变量x
望求解答，多谢
Ps：下面只节选了部分代码
class SiamMask(nn.Module):
def __init__(self, anchors=None, o_sz=127, g_sz=127):
super(SiamMask, self).__init__()
self.anchors = anchors # anchor_cfg
self.anchor_num = len(self.anchors["ratios"]) * len(self.anchors["scales"])
self.anchor = Anchors(anchors)
self.features = None
self.rpn_model = None
self.mask_model = None
self.o_sz = o_sz
self.g_sz = g_sz
self.upSample = nn.UpsamplingBilinear2d(size=[g_sz, g_sz])
self.all_anchors = None
def set_all_anchors(self, image_center, size):
# cx,cy,w,h
if not self.anchor.generate_all_anchors(image_center, size):
return
all_anchors = self.anchor.all_anchors[1] # cx, cy, w, h
self.all_anchors = torch.from_numpy(all_anchors).float().cuda()
self.all_anchors = [self.all_anchors[i] for i in range(4)]
def feature_extractor(self, x):
return self.features(x)
def rpn(self, template, search):
pred_cls, pred_loc = self.rpn_model(template, search)
return pred_cls, pred_loc
看这个例子
class test():
def __init__(self):
self.f = None
def t(self, x):
return self.f(x)
def ft(x):
return x+33
T = test()
T.f = ft
res = T.t(22)
print(res)
"""--result
55
"""
self.features是一个函数，调用他传入x后return一个值，所以self.features（x）就是一个具体的值。