import itertools
原tweet = "I luv my <3 iphone & youre awsm apple. DisplayIsAwesome, sooo happppppy :) http://www.apple.com"
经过tweet = ''.join(''.join(s)[:2] for _, s in itertools.groupby(tweet))
结果tweet = "I luv my <3 iphone & youre awsm apple. DisplayIsAwesome, soo happy :) http://ww.apple.com"
求指教实现过程是怎么样的?