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mccutchen/gist:1040802

Created June 22, 2011 18:48
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Simple App Engine mapreduce counter example
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gistfile1.py
from google.appengine.ext.mapreduce import operation as op
def count_impressions_by_month(entity):
key = entity.timestamp.strftime('%Y-%m')
yield op.counters.Increment(key)
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