Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/18710#discussion_r130921196
--- Diff: python/pyspark/sql/functions.py ---
@@ -1424,7 +1424,9 @@ def substring(str, pos, len):
"""
Substring starts at `pos` and is of length `len` when str is String
type or
returns the slice of byte array that starts at `pos` in byte and is of
length `len`
- when str is Binary type
+ when str is Binary type.
+
--- End diff --
Ah, PEP8 doens't like the trailing whitespace:
`./python/pyspark/sql/functions.py:1428:1: W293 blank line contains
whitespace`
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