Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Python’s list method sort includes the keyword argument reverse, whose default
value is False. The programmer can override this value to sort a list in descending
order. Modify the selectionSort function so that it allows
the programmer to supply this additional argument to redirect the sort.

selectionSort function:

def selectionSort(lyst, profiler):
i = 0
while i < len(lyst) - 1:
minIndex = i
j = i + 1
while j < len(lyst):
profiler.comparison() # Count
if lyst[j] < lyst[minIndex]:
minIndex = j
j += 1
if minIndex != i:
swap(lyst, minIndex, i, profiler)
i += 1
def swap(lyst, i, j, profiler):
"""Exchanges the elements at positions i and j."""
profiler.exchange() # Count
temp = lyst[i]
lyst[i] = lyst[j]
lyst[j] = temp

Use this template in Python to modify the function above:

def selection_sort(input_list, reverse):
sorted_list = []
#TODO: Your work here
# Return sorted_list
return sorted_list
if __name__ == "__main__":
my_list = [1, 2, 3, 4, 5]
print(selection_sort(my_list, True)) # Correct Output: [5, 4, 3, 2, 1]

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