Web Reference: Oct 31, 2008 · 677 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. In the example you gave, there is no difference, in terms of output, between append and +=. But there is a difference between append and + (which the question originally asked about). 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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