如何保持github的fork于主干同步

step1: 

https://help.github.com/articles/configuring-a-remote-for-a-fork/

step2:

https://help.github.com/articles/syncing-a-fork/

 

fork and PR  

https://gist.github.com/Chaser324/ce0505fbed06b947d962

 

pull and apply a patch

https://stackoverflow.com/questions/7827002/how-to-apply-a-git-patch-when-given-a-pull-number

 

update centos python:

https://blog.fazero.me/2016/10/13/centos-update-python/

cd /home/

virtualenv --python=/usr/local/python2.7.12/bin/python2.7 py2.7.12ENV

source py2.7.12ENV/bin/activate