Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/1042#issuecomment-50102861
It looks like `unittest2` isn't the only change required for the unit tests
to pass on Python 2.6.
In `tests.py`, `createFileInZip()` uses `ZipFile` as a context manager,
which is only supported in Python 2.7+
(https://docs.python.org/2.7/library/zipfile.html?highlight=zipfile#zipfile.ZipFile):
```python
with zipfile.ZipFile(path, 'w') as zip:
zip.writestr(name, content)
return path
```
We should probably replace this with a try-finally block.
There's a neat tool called [pyqver](https://github.com/ghewgill/pyqver)
that aims to identify the minimum required Python version for a particular
script. Unfortunately, it doesn't detect this ZipFile issue; I'll look into
opening a pull request to add a check for it.
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