Web Reference: Oct 31, 2008 · What is the difference between the list methods append and extend? .append() adds its argument as a single element to the end of a list. The length of the list itself will increase by one. .extend() iterates over its argument adding each element to the list, extending the list. The length of the list will increase by however many elements were in the iterable argument. .append() The .append ... ary.extend (ext) merely adds reference to "ext" list to the end of the "ary" list, resulting in less memory transactions. As a result, .extend works orders of magnitude faster and doesn't use any additional memory outside of the list being extended and the list it's being extended with. Is there an article or forum discussion or something somewhere that explains why lists use append/extend, but sets and dicts use add/update? I frequently find myself converting lists into sets and ...
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