Hey everyone! I'm currently working through John Zelle's CS book and I got stuck on an exercise that requires me to implement several classic Python functions, including the sort function. I'm having trouble figuring out how to create a sorting algorithm that works with both lists of numbers and strings. I decided to check the book's solution, but I still don't quite understand how it works. Can anyone explain the solution in simple terms? I'm at chapter 9. Here's the code from the book:
def sort(lst):
# selection sort. See Chapter 14 for other examples.
for i in range(len(lst)-1):
# find min of remaining items
minpos = i
for j in range(i+1, len(lst)):
if lst[j] < lst[minpos]:
minpos = j
# swap min to front of remaining
lst[i], lst[minpos] = lst[minpos], lst[i]
return lst
3 Answers
To get started, it's important to understand both the selection sort algorithm and how it's implemented in this code. Essentially, selection sort works by repeatedly finding the minimum element from an unsorted part of the list and moving it to the front.
In the code, the outer loop goes through each index in the list, and the inner loop compares the items to find the smallest one. Once it finds the minimum, it swaps that with the current index. This process repeats until the whole list is sorted. It's a straightforward way to sort, though there are more efficient methods for larger datasets!
You might find it useful to look up some visual explanations of selection sort online. It's a pretty simple algorithm where, for each position in the list, you keep track of the minimum value found so far and swap it with the current position. This keeps happening until the whole array is sorted. It’s great for understanding the basics of sorting!
An important thing to remember is that this method isn't the most efficient for large lists, but it's really useful for understanding how sorting works. A lot of resources online have animations that can help visualize what happens step by step in the algorithm.
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