The bubble up procedure by python

 

array = [1,6,7,2,9,4]
for i in range(len(array)-1,1,-1):
    for j in range(0,i):
        if array[j] > array[j+1]:
            array[j],array[j+1] = array[j+1],array[j]
print array

Wow, Python is so powerful, Let start to enjoy it now!