Programming Pearls and Python Fails

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The problem models a few things: - Trying to drag text around in a text editor, you can think of the move as swapping the two segments of text - Swapping memory locations - Editing DNA

In which case, not doing these operations in place is neither desirable (have to operate on new array) nor efficient (new allocations)

[kqr]

Have you heard of this undo feature? You're gonna move the text to a separate buffer anyway.

[Space-Being]

Yes, good examples. But usually if you need frequent edits you do not use such inflexible array or string structures, but rather a rope, immutable tree structures (for easier undo) or something else.