I have such a problem
(face_det) user@pc:~$ python3 Python 3.5.3 (default, Apr 22 2017, 00:00:00) [GCC 4.8.4] on linux Type \"help\", \"copyright\", \"credi
I think you're on Linux judging by pc:~$
pc:~$
Try installing from the following link:
http://docs.opencv.org/3.0-beta/doc/tutorials/introduction/linux_install/linux_install.html