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About The Author of this book Magnus Lie Hetland , is an experienced Python programmer, having used the  language since the late 90s. He is also an associate professor of algorithms at the  Norwegian University of Science and Technology and has taught algorithms for  the better part of a decade. Hetland is the author of Beginning Python (originally  Practical Python).  Introduction  Consider the following problem. You are to visit all the cities, towns, and villages of, say, Sweden and  then return to your starting point. This might take a while (there are 24 978 locations to visit, after all), so  you want to minimize your route. You plan on visiting each location exactly once, following the shortest  route possible. As a programmer, you certainly don’t want to plot the route by hand. Rather, you try to  write some code that will plan your trip for you. For some reason, however, you can’t seem to get it right.  A straightforward program works well for a smaller number