HyukjinKwon commented on a change in pull request #26824: 
[SPARK-30197][PYSPARK] Add minimum `requirements.txt` file to `python` directory
URL: https://github.com/apache/spark/pull/26824#discussion_r355803484
 
 

 ##########
 File path: python/requirements.txt
 ##########
 @@ -0,0 +1,4 @@
+numpy==1.16.4
+scipy==1.2.2
+pandas==0.23.2
+pyarrow==0.15.1
 
 Review comment:
   @dongjoon-hyun how about we put this in 
https://github.com/apache/spark/blob/master/dev/requirements.txt since these 
are optional dependencies (and we can say it's needed for the dev?)
   
   ```
   # ML/MLlib
   numpy>=1.7
   scipy>=1.2.2
   # SQL
   pandas>=0.23.2
   pyarrow>=0.15.1
   ```

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