pyspark on yarn appears Cannot run program python3

Start a pyspark on yarn:

$ pyspark --master yarn
Welcome to
      ____              __
     / __/__  ___ _____/ /__
    _\ \/ _ \/ _ `/ __/  '_/
   /__ / .__/\_,_/_/ /_/\_\   version 3.2.0
      /_/

Using Python version 3.8.12 (default, Nov 12 2021 08:41:47)
Spark context Web UI available at http://master:4041
Spark context available as 'sc' (master = yarn, app id = application_1652774608535_0001).
SparkSession available as 'spark'.
>>

Submit a task:

>>> sc.parallelize([1,2]).map(lambda x:x*10).collect()

report error

 java.io.IOException: Cannot run program "python3": error=2, No such file or directory  
 ......

Solution, add environment variable:

export PYSPARK_PYTHON=$PYTHON_HOME/bin/python3

Reboot, executed successfully