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Fix coding errors (#149)
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@ -26,7 +26,7 @@ class HitCounts(MRJob):
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period = self.extract_year_month(line)
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yield (period, url), 1
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def reducer(self, key, value):
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def reducer(self, key, values):
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"""Sum values for each key.
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(2016-01, url0), 2
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