Web Reference: 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). 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. Jan 7, 2015 · Now that all of this is clear, we should be able to intuit the answer to the question "How does append work in Python?" The result of the append() method is an operation on the mutable list object itself. The list is changed "in place", so to speak. There is not a new list created and then assigned to the foo-local x.
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