现在，如果我在shell运行python3，然后import cv2; cv2.xfeature2d没有错误，它将被导入但是如果我激活了虚拟环境
AttributeError将被提出
我在/usr/local/lib/python3/dist-packages/cv2.python3.....so将cv2.so与~/virtualenv/lib/python3.5/site-packages/相关联，import cv2工作正常但cv2.xfeature2d提升了AttributeError: module 'cv2.cv2' has no attribute 'xfeature2d'