def qwflat(words,sep=None,maxsplit=-1):
    return qw(words,1,sep,maxsplit)
Re-define this to define an action to run after the combiner reaches
dataset/ETHPy150Open ipython/ipython-py3k/IPython/utils/text.py/qwflat--crossover with--dataset/ETHPy150Open Yelp/mrjob/mrjob/job.py/MRJob.combiner_final