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"""

https://en.wikipedia.org/wiki/Bubble_sort

Worst-case performance: O(N^2)

If you call bubble_sort(arr,True), you can see the process of the sort

Default is simulation = False

"""

def bubble_sort(arr, simulation=False):

def swap(i, j):

arr[i], arr[j] = arr[j], arr[i]

n = len(arr)

swapped = True

iteration = 0

if simulation:

print("iteration",iteration,":",*arr)

x = -1

while swapped:

swapped = False

x = x + 1

for i in range(1, n-x):

if arr[i - 1] > arr[i]:

swap(i - 1, i)

swapped = True

if simulation:

iteration = iteration + 1

print("iteration",iteration,":",*arr)

return arr