[jira] [Created] (SPARK-26831) bin/pyspark: avoid hardcoded `python` command and improve version checks

["Stefaan Lippens (JIRA)" <ji...@apache.org>]

Stefaan Lippens created SPARK-26831:
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             Summary: bin/pyspark: avoid hardcoded `python` command and improve version checks
                 Key: SPARK-26831
                 URL: https://issues.apache.org/jira/browse/SPARK-26831
             Project: Spark
          Issue Type: Improvement
          Components: PySpark
    Affects Versions: 2.4.0
            Reporter: Stefaan Lippens


(this originally started at https://github.com/apache/spark/pull/23736)

I was trying out pyspark on a system with only a {{python3}}  command but no {{python}} command and got this error:

{code}
/opt/spark/bin/pyspark: line 45: python: command not found
{code}

While the pyspark script is full of variables to refer to a python interpreter there is still a hardcoded {{python}} used for

{code}
WORKS_WITH_IPYTHON=$(python -c 'import sys; print(sys.version_info >= (2, 7, 0))')
{code}

While looking into this, I also noticed the bash syntax for the IPython version check is wrong: 
{code}
if [[ ! $WORKS_WITH_IPYTHON ]]
{code}
always evaluates to false when {{$WORKS_WITH_IPYTHON}} is non-empty (so in both cases "True" and "False")



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