[GitHub] [spark] wangyum opened a new pull request #26848: [WIP][SPARK-30216][INFRA] Use python3 in Docker release image

[GitBox <gi...@apache.org>]

wangyum opened a new pull request #26848: [WIP][SPARK-30216][INFRA] Use python3 in Docker release image
URL: https://github.com/apache/spark/pull/26848
 
 
   ### What changes were proposed in this pull request?
   
   This PR switches python to python3 in Docker release image.
   
   ### Why are the changes needed?
   `dev/make-distribution.sh` and `python/setup.py` are use python3.
   https://github.com/apache/spark/pull/26844/files#diff-ba2c046d92a1d2b5b417788bfb5cb5f8L236
   https://github.com/apache/spark/pull/26330/files#diff-8cf6167d58ce775a08acafcfe6f40966
   
   
   
   ### Does this PR introduce any user-facing change?
   No.
   
   
   ### How was this patch tested?
   
   manual test:
   ```
   dev/create-release/do-release-docker.sh -n -d /home/yumwang/spark-release
   ```

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