[color=#00AA00][b]Status of information: 2015-01-09[/b][/color]
If you want to submit a Python code, you actually can choose between [b]
5 Python versions
In addition to the well known differences between Python 2.x and Python 3.x there are some other things that are poorly or not at all documented.
Pyramid cluster (slow)
can use Python 2.7.9, Python 3.2.3 and Python 3.2.3 nbc here (I don't know the difference between the last two).
[color=#FF0000]You can't use PyPy 2.4 or Python 3.4[/color], even if you can select it from the list of languages. It leads to internal error.
Cube cluster (fast)
can use all offered Python versions. Moreover you can use the numpy/scipy module with all CPython versions.