Github user purechoc commented on the issue:
https://github.com/apache/zeppelin/pull/1587
first, you need to install livy and setup python3 environment.
second, set config. "spark-defaults.conf"
spark.yarn.appMasterEnv.PYSPARK3_DRIVER_PYTHON usr/bin/python3
and then, just using livy interpreter with "%livy.pyspark3"
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