Eclipse+PyDev+GAE memcache error

 Using memcache in GAE like this in my code:

tenth = memcache.get('tenth') 

There is an error notification in Eclipse+PyDev, but it works well. Checked a website, found other people have the same problem, so that's just a bug of PyDev, not mine, luckily.

Reference: http://stackoverflow.com/questions/1469860/eclipsepydevgae-memcache-error