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Clarify docstring for Pyspark's foreachPartition #2895

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Clarify docstring for Pyspark's foreachPartition #2895

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5 changes: 5 additions & 0 deletions python/pyspark/rdd.py
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Original file line number Diff line number Diff line change
Expand Up @@ -634,6 +634,11 @@ def processPartition(iterator):
def foreachPartition(self, f):
"""
Applies a function to each partition of this RDD.


Note: Due to implementation, f must either return an iterable object
or be a generator function. However, foreachPartition always returns
`None`.

>>> def f(iterator):
... for x in iterator:
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