PySpark groupByKey returning pyspark.resultiterable.ResultIterable

Question

I am trying to figure out why my groupByKey is returning the following:

[(0, ), (1, 

        

Answer 1

What you're getting back is an object which allows you to iterate over the results. You can turn the results of groupByKey into a list by calling list() on the values, e.g.

example = sc.parallelize([(0, u'D'), (0, u'D'), (1, u'E'), (2, u'F')])

example.groupByKey().collect()
# Gives [(0,