How to rollback when facing deploy error at GAE

step1. cd "C:\Program Files (x86)\Google\google_appengine"
step2. appcfg.py rollback "D:\tagtoo dev\new svn - tagtoo new server\src"

Note: 若要rollback 特定version, 必須在app.yaml 裡面設定好

注意, 若是在Air (python 沒加進環境變數裡的環境), 則是 python appcfg.py rollback "D:\tagtoo dev\new svn - tagtoo new server\src"