dongjoon-hyun 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_r355820025
 
 

 ##########
 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:
   Sure. Thanks. I'll do the followings.
   1. Move to `dev`.
   2. Test with numpy==1.7 and use that version. (I saw it in the setup.py, but 
last time, it didn't work for me.)
   
   BTW, I'll use `==` instead of `>=` since it's risky (especially for 
`pyarrow`).
   That's the reason why this PR title is `minimum` instead of `valid range`.

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