pip

pip

## 清华
pip install -i https://pypi.tuna.tsinghua.edu.cn/simple
## 豆瓣
pip install -i http://pypi.douban.com/simple/ --upgrade numpy

pip install -t /usr/local/lib/python2.7/site-packages/ xlrd

sudo pip3.7  install -i https://pypi.tuna.tsinghua.edu.cn/simple

list

pip list

Package              Version    
-------------------- -----------
absl-py              0.9.0      
aiohttp              3.6.2      
allow                0.0.3      
alot                 0.9        
appdirs              1.4.3     

show

pip show opencv-python
'''
Name: opencv-python
Version: 4.1.2.30
Summary: Wrapper package for OpenCV python bindings.
Home-page: https://github.com/skvark/opencv-python
Author: None
Author-email: None
License: MIT
Location: /usr/local/lib/python3.7/site-packages
Requires: numpy
Required-by:
'''