Nested looping a Python list-CodePudding

I have a list of length 6 with L[5] = 3 fixed. I need to loop it around 243 times( or something) to get the combination in a particular order.

The L[4] will keep going 1,2,3 and L[3] would be the same for that time and then it moves right to left. I know it will be some nested loop but can't do it properly. The list can be initialized as anything but L[5] needs to be 3 and the first combination will be L = [1,1,1,1,1,3] and the last combination will be [3,3,3,3,3,3]

CodePudding user response：

IIUC you can use itertools.product:

from itertools import product

vals = [[1, 2, 3]] * 5   [[3]]

for c in product(*vals):
    print(c)

Prints:

(1, 1, 1, 1, 1, 3)
(1, 1, 1, 1, 2, 3)
(1, 1, 1, 1, 3, 3)
(1, 1, 1, 2, 1, 3)
(1, 1, 1, 2, 2, 3)
(1, 1, 1, 2, 3, 3)
(1, 1, 1, 3, 1, 3)
(1, 1, 1, 3, 2, 3)
(1, 1, 1, 3, 3, 3)
(1, 1, 2, 1, 1, 3)

...

(3, 3, 3, 3, 1, 3)
(3, 3, 3, 3, 2, 3)
(3, 3, 3, 3, 3, 3)

CodePudding user response：

Something like this should work:

list = []

for i in range(1,4):
    for j in range(1,4):
        for k in range(1,4):
            for l in range(1,4):
                for m in range(3,4):
                    list.append([i,j,k,l,m])

for elem in list:
    print(elem)

Output:

[1, 1, 1, 1, 3]
[1, 1, 1, 2, 3]
[1, 1, 1, 3, 3]
[1, 1, 2, 1, 3]
[1, 1, 2, 2, 3]
[1, 1, 2, 3, 3]
[1, 1, 3, 1, 3]
[1, 1, 3, 2, 3]
[1, 1, 3, 3, 3]
[1, 2, 1, 1, 3]
[1, 2, 1, 2, 3]
[1, 2, 1, 3, 3]
[1, 2, 2, 1, 3]
[1, 2, 2, 2, 3]
[1, 2, 2, 3, 3]
[1, 2, 3, 1, 3]
[1, 2, 3, 2, 3]
[1, 2, 3, 3, 3]
[1, 3, 1, 1, 3]
[1, 3, 1, 2, 3]
[1, 3, 1, 3, 3]
[1, 3, 2, 1, 3]
[1, 3, 2, 2, 3]
[1, 3, 2, 3, 3]
[1, 3, 3, 1, 3]
[1, 3, 3, 2, 3]
[1, 3, 3, 3, 3]
[2, 1, 1, 1, 3]
[2, 1, 1, 2, 3]
[2, 1, 1, 3, 3]
[2, 1, 2, 1, 3]
[2, 1, 2, 2, 3]
[2, 1, 2, 3, 3]
[2, 1, 3, 1, 3]
[2, 1, 3, 2, 3]
[2, 1, 3, 3, 3]
[2, 2, 1, 1, 3]
[2, 2, 1, 2, 3]
[2, 2, 1, 3, 3]
[2, 2, 2, 1, 3]
[2, 2, 2, 2, 3]
[2, 2, 2, 3, 3]
[2, 2, 3, 1, 3]
[2, 2, 3, 2, 3]
[2, 2, 3, 3, 3]
[2, 3, 1, 1, 3]
[2, 3, 1, 2, 3]
[2, 3, 1, 3, 3]
[2, 3, 2, 1, 3]
[2, 3, 2, 2, 3]
[2, 3, 2, 3, 3]
[2, 3, 3, 1, 3]
[2, 3, 3, 2, 3]
[2, 3, 3, 3, 3]
[3, 1, 1, 1, 3]
[3, 1, 1, 2, 3]
[3, 1, 1, 3, 3]
[3, 1, 2, 1, 3]
[3, 1, 2, 2, 3]
[3, 1, 2, 3, 3]
[3, 1, 3, 1, 3]
[3, 1, 3, 2, 3]
[3, 1, 3, 3, 3]
[3, 2, 1, 1, 3]
[3, 2, 1, 2, 3]
[3, 2, 1, 3, 3]
[3, 2, 2, 1, 3]
[3, 2, 2, 2, 3]
[3, 2, 2, 3, 3]
[3, 2, 3, 1, 3]
[3, 2, 3, 2, 3]
[3, 2, 3, 3, 3]
[3, 3, 1, 1, 3]
[3, 3, 1, 2, 3]
[3, 3, 1, 3, 3]
[3, 3, 2, 1, 3]
[3, 3, 2, 2, 3]
[3, 3, 2, 3, 3]
[3, 3, 3, 1, 3]
[3, 3, 3, 2, 3]
[3, 3, 3, 3, 3]