I'd like to list the number of 3*3 cases using Python.

mylist = [[1,2,3],[4,5,6],[7,8,9]]

mylist[0][0]
mylist[0][1]
mylist[0][2]

mylist[1][0]
mylist[1][1]
mylist[1][2]

mylist[2][0]
mylist[2][1]
mylist[2][2]

mylist = [[1,2,3],[4,5,6],[7,8,9]]

for i in range(3):
    for j in range(3):
       print(mylist[i][j])

mylist = []
for i in range(3):
    for j in range(3):
            for k in range(3):
                mylist[i][j][k] = i+j+k
                print(mylist[i][j][k])