$ curl https://bootstrap.pypa.io/pip/2.7/get-pip.py --output get-pip.py
$ python get-pip.py 
$ sudo yum install libXrender-0.9.10-1.el7.x86_64 --setopt=protected_multilib=false
$ sudo yum install libXext-1.3.3-3.el7.x86_64 --setopt=protected_multilib=false
$ sudo yum install libSM-1.2.2-2.el7.x86_64 --setopt=protected_multilib=false
$ pip2 install opencv-python==4.1.1.26
$ pip install requests
$ pip install Pillow

检测 安装 cv2 是否成功

[root@xxx xxx]# python
Python 2.7.5 (default, Nov 16 2020, 22:23:17) 
[GCC 4.8.5 20150623 (Red Hat 4.8.5-44)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import cv2
>>>