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PEP 8 suggests separately grouping stdlib, dependency, and local package imports. Within idlelib, idlelib imports are treated as local package imports. Tkinter is sometimes treated as a dependency, which makes its imports easy to notice, and I want to do this consistently. It is conventional to sort imports within each group. This is sometimes true now, sometimes not (even before the 3.6 renaming).
The possible danger of rearranging imports is that a line gets deleted and not pasted. Rietveld's side-by-side diff should make this easy to detect.
This issue is about re-arranging the imports currently at the top of a file, and any module level imports that I notice elsewhere. Dealing with delayed imports within functions and classed will be another issue, which will depend on this one.