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https://issues.apache.org/jira/browse/SPARK-21658?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16118044#comment-16118044
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Liang-Chi Hsieh commented on SPARK-21658:
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[~mgaido] If you don't mind, I'm mentoring a beginner to work on this.

> Adds the default None for value in na.replace in PySpark to match
> -----------------------------------------------------------------
>
>                 Key: SPARK-21658
>                 URL: https://issues.apache.org/jira/browse/SPARK-21658
>             Project: Spark
>          Issue Type: Bug
>          Components: PySpark
>    Affects Versions: 2.2.0
>            Reporter: Hyukjin Kwon
>            Priority: Minor
>              Labels: Starter
>
> Looks {{na.replace}} missed the default value {{None}}.
> Both docs says they are aliases 
> http://spark.apache.org/docs/2.2.0/api/python/pyspark.sql.html#pyspark.sql.DataFrame.replace
> http://spark.apache.org/docs/2.2.0/api/python/pyspark.sql.html#pyspark.sql.DataFrameNaFunctions.replace
> but the default values looks different, which ends up with:
> {code}
> >>> df = spark.createDataFrame([('Alice', 10, 80.0)])
> >>> df.replace({"Alice": "a"}).first()
> Row(_1=u'a', _2=10, _3=80.0)
> >>> df.na.replace({"Alice": "a"}).first()
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
> TypeError: replace() takes at least 3 arguments (2 given)
> {code}
> To take the advantage of SPARK-19454, sounds we should match them.



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