Simple Bubble Sort in Python

bubblesort.py

def bubble_sort(data):
	i, j, swap = 0, 0, 0
	while i < len(data) - 1:
		while j < len(data) - 1:
			if data[j] > data[j+1]:
				data[j], data[j+1] = data[j+1], data[j]
				swap += 1
			j += 1
		if swap == 0:  # If no change find, so array is already sorted
			break
		j = 0
		i += 1
	return data

print(bubble_sort([3,2,1]))
# [1, 2, 3]