Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/20682#discussion_r171738290
--- Diff: python/pyspark/heapq3.py ---
@@ -883,7 +883,7 @@ def nlargest(n, iterable, key=None):
if __name__ == "__main__":
- import doctest
+ import doctest, sys
--- End diff --
Shell we import this separately? -
https://www.python.org/dev/peps/pep-0008/#imports
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