flask-cache使用redis缓存出现的错误

Flask-Cache是flask一个缓存扩展，可用使用simple、redis、memcache等缓存视图及其他，文档：http://www.pythondoc.com/flask-cache/index.html

在使用Flask-Cache时，采用redis做后端，遇到的问题：

Traceback (most recent call last):
  File "main.py", line 28, in <module>
    cache.init_app(app)
  File "/usr/lib/python2.7/site-packages/flask_cache/__init__.py", line 161, in init_app
    self._set_cache(app, config)
  File "/usr/lib/python2.7/site-packages/flask_cache/__init__.py", line 172, in _set_cache
    import_me))
ImportError: redis is not a valid FlaskCache backend

其实是因为采用redis做后端缓存需要redis python模块，pip install redis，OK！

也可以查看flask-cache仓库的issue: https://github.com/thadeusb/flask-cache/issues/126

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