Truncate with an ellipsis in Python
Python interview exercise on Strings, difficulty 1 of 3. Solve it in the editor beside a worked example; the tests run the moment you do.
Write truncate(s, max_len) that returns s unchanged if it has at most max_len characters, otherwise the first max_len characters followed by "…". A Python str is a sequence of characters, not bytes, so slicing is safe with accents.
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