I've just done some work on the (long awaited!) addition of line numbers to IDLE, and have a working PR ready. If some of you could try it out and give some feedback, that would be very helpful!
See bpo-17535 <https://bugs.python.org/issue17535> for details; the PR is GH-14030 <https://github.com/python/cpython/pull/14030>. Note that this is only for Python 3.
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