Github user cocoatomo commented on the pull request:
https://github.com/apache/spark/pull/2554#issuecomment-57660342
Thank you for the suggestions, mattf and JoshRosen.
I deleted the sentence about IPYTHON and IPYTHON_OPTS,
and replace "-u" option with PYTHONUNBUFFERED.
To confirm that PYTHONUNBUFFERED is set,
we can run a python executable with a following python script set as an
argument.
```python
# env.py
import os
print os.environ['PYTHONUNBUFFERED']
```
```bash
$ PYSPARK_PYTHON=ipython ./bin/pyspark env.py
...
YES
```
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