RuntimeError: Working outside of application context.

flask执行错误：

问题：RuntimeError: Working outside of application context.

方法：

from flask import Flask, current_app

app = Flask(__name__)

with app.app_context():
    # within this block, current_app points to app.
    print current_app.name

参考：

http://stackoverflow.com/questions/33771465/runtimeerror-working-outside-of-application-context-when-learning-testing-flas

https://sentry.io/answers/flask-working-outside-of-application-context/