Enhance docstring for selection_sort function

sorts/selection_sort.py

@@ -2,9 +2,16 @@ def selection_sort(collection: list[int]) -> list[int]:
     """
     Sorts a list in ascending order using the selection sort algorithm.
 
+    Selection sort works by repeatedly finding the minimum element from the
+    unsorted portion of the list and placing it at the beginning.
+
     :param collection: A list of integers to be sorted.
     :return: The sorted list.
 
+    Time Complexity: O(n^2) - where n is the number of elements.
+        The algorithm always makes n*(n-1)/2 comparisons regardless of input.
+    Space Complexity: O(1) - sorts in place using only a constant amount of extra space.
+
     Examples:
     >>> selection_sort([0, 5, 3, 2, 2])
     [0, 2, 2, 3, 5]
@@ -15,7 +22,6 @@ def selection_sort(collection: list[int]) -> list[int]:
     >>> selection_sort([-2, -5, -45])
     [-45, -5, -2]
     """
-
     length = len(collection)
     for i in range(length - 1):
         min_index = i
@@ -28,7 +34,9 @@ def selection_sort(collection: list[int]) -> list[int]:
 
 
 if __name__ == "__main__":
+    import doctest
+
+    doctest.testmod()
     user_input = input("Enter numbers separated by a comma:\n").strip()
     unsorted = [int(item) for item in user_input.split(",")]
-    sorted_list = selection_sort(unsorted)
-    print("Sorted List:", sorted_list)
+    print(selection_sort(unsorted))