Bubble sort in Python

bubble.py

def bubble(list):

	length = len(list) - 1
	sorted = False

	while not sorted:

		sorted = True

		for i in range(length):

			if list[i] > list[i + 1]:

				sorted = False

				list[i], list[i + 1] = list[i + 1], list[i]

	return list

print bubble([3, 6, 2, 5, 1, 6, 2])

Hello, it seems there is mistake in the code:
def bubble(list_):
length_ = len(list_) - 1
sorted_ = False

while not sorted_:
    sorted_ = True
    for i in range(length_):
        if list_[i] > list_[i + 1]:
            sorted = False
            list_[i], list_[i + 1] = list_[i + 1], list_[i]
return list_

exmaple:
a = [8,1,2,4,1,3,5,1,5,6,1,8]
bubble(a)

result:

Out[27]:
[1, 2, 4, 1, 3, 5, 1, 5, 6, 1, 8, 8]