A user reported that the `%pastebin` magic command in ipython, submitting to dpaste, was receiving HTTP 400 responses. The cause: the 'python3' syntax name ipython submits is no longer valid (Python 3 is now 'python' and Python 2 is 'python2'). I've added logic to allow this to work again, and will put in a PR on ipython to fix. Grateful for the report!
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