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This web page nomen-infitior.blogspot.com states the following, "Понедельник, 14 марта 2016 г." We saw that the webpage said " How to expand an iterator into a list in Python3." It also said " One of the most noticeable changes from Python 2 to Python 3 is that map, filter, zip and range builtins now return iterators instead of lists. This is usually a good feature to have, because, well, nobody uses range outside of a. But there may be rare cases when resulting list might take less memory then the iterator itself, especially when you nesting them like this."