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https://issues.apache.org/jira/browse/SPARK-25397?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16609593#comment-16609593
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Joseph K. Bradley commented on SPARK-25397:
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CC [~smilegator], [~cloud_fan] for visibility
> SparkSession.conf fails when given default value with Python 3
> --------------------------------------------------------------
>
> Key: SPARK-25397
> URL: https://issues.apache.org/jira/browse/SPARK-25397
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.3.1
> Reporter: Joseph K. Bradley
> Priority: Major
>
> Spark 2.3.1 has a Python 3 incompatibility when requesting a Conf value from
> SparkSession when you give non-string default values. Reproduce via
> SparkSession call:
> {{spark.conf.get("myConf", False)}}
> This gives the error:
> {code}
> >>> spark.conf.get("myConf", False)
> Traceback (most recent call last):
> File "<stdin>", line 1, in <module>
> File
> "/Users/josephkb/work/spark-bin/spark-2.3.1-bin-hadoop2.7/python/pyspark/sql/conf.py",
> line 51, in get
> self._checkType(default, "default")
> File
> "/Users/josephkb/work/spark-bin/spark-2.3.1-bin-hadoop2.7/python/pyspark/sql/conf.py",
> line 62, in _checkType
> if not isinstance(obj, str) and not isinstance(obj, unicode):
> *NameError: name 'unicode' is not defined*
> {code}
> The offending line in Spark in branch-2.3 is:
> https://github.com/apache/spark/blob/branch-2.3/python/pyspark/sql/conf.py
> which uses the value {{unicode}} which is not available in Python 3.
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