学习flask web开发遇到的一些问题及解决方法

Q：ExtDeprecationWarning: Importing flask.ext.script is deprecated, use flask_script instead.

.format(x=modname), ExtDeprecationWarning

A：把

flask.ext.script

中的

.ext.

换成下划线

_

Q:UserWarning: SQLALCHEMY_TRACK_MODIFICATIONS adds significant overhead and will be disabled by default in the future. Set it to True to suppress this warning.

warnings.warn(‘SQLALCHEMY_TRACK_MODIFICATIONS adds significant overhead and will be disabled by default in the future. Set it to True to suppress this warning.’)

A:在代码中加一行

track_modifications = app.config.setdefault('SQLALCHEMY_TRACK_MODIFICATIONS'    , True)

Q：heroku login出现问题 如图:



A：原因是ruby版本太低，需升级。命令如下：

$ sudo apt-add-repository ppa:brightbox/ruby-ng
$ sudo apt-get update
$ sudo apt-get install ruby2.2

$ ruby2.2 -v
ruby 2.2.0p0 (2014-12-25 revision 49005) [x86_64-linux-gnu]

参考链接：1.http://stackoverflow.com/questions/26595620/how-to-install-ruby-2-1-4-on-ubuntu-14-04

2.http://qiita.com/35_267_/items/29badc389a1df4d56c6f