[jira] [Created] (SPARK-31341) Spark documentation incorrectly claims 3.8 compatibility

["Daniel King (Jira)" <ji...@apache.org>]

Daniel King created SPARK-31341:
-----------------------------------

             Summary: Spark documentation incorrectly claims 3.8 compatibility
                 Key: SPARK-31341
                 URL: https://issues.apache.org/jira/browse/SPARK-31341
             Project: Spark
          Issue Type: Bug
          Components: PySpark
    Affects Versions: 2.4.5
            Reporter: Daniel King


The Spark documentation ([https://spark.apache.org/docs/latest/]) has this text:
{quote}Spark runs on Java 8, Python 2.7+/3.4+ and R 3.1+. For the Scala API, Spark 2.4.5 uses Scala 2.12. You will need to use a compatible Scala version (2.12.x).
{quote}
Which suggests that Spark is compatible with Python 3.8. This is not true. For example in the latest ubuntu:18.04 docker image:

 
{code:python}
apt-get update
apt-get install python3.8 python3-pip
pip3 install pyspark
python3.8 -m pip install pyspark
python3.8 -c 'import pyspark'
{code}
Outputs:

{code:python}
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/local/lib/python3.8/dist-packages/pyspark/__init__.py", line 51, in <module>
    from pyspark.context import SparkContext
  File "/usr/local/lib/python3.8/dist-packages/pyspark/context.py", line 31, in <module>
    from pyspark import accumulators
  File "/usr/local/lib/python3.8/dist-packages/pyspark/accumulators.py", line 97, in <module>
    from pyspark.serializers import read_int, PickleSerializer
  File "/usr/local/lib/python3.8/dist-packages/pyspark/serializers.py", line 72, in <module>
    from pyspark import cloudpickle
  File "/usr/local/lib/python3.8/dist-packages/pyspark/cloudpickle.py", line 145, in <module>
    _cell_set_template_code = _make_cell_set_template_code()
  File "/usr/local/lib/python3.8/dist-packages/pyspark/cloudpickle.py", line 126, in _make_cell_set_template_code
    return types.CodeType(
TypeError: an integer is required (got type bytes)
{code}

I propose the documentation is updated to say "Python 3.4 to 3.7". I also propose the `setup.py` file for pyspark include:
{code:python}
    python_requires=">=3.6,<3.8",
{code}



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