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Emacs can do this!

• pjscott 16y ago
  Specifically, you set the mark at one corner (C-Space) and move the mark to the other corner. Then you can do rectangle editing with commands like kill (C-x r k), yank (C-x r y) or something to insert a string (C-x r t). These are hugely useful when moving blocks of Python code around, for fiddling with the indentation.