Multiple index loop in Python

Question

I need to make several nested loops like this, but with a generic number of looping indices:

   for ii in range(0,num):
      for iii in range(0,num):
         for iiii in range(0,num):
            for iiiii in range(0,num):

Is it there any compact or practical way to do this? Thanks in advance.

I am unclear what you need to do and why. Could you explain it in a bit more detail? edit your minimal reproducible example. — Patrick Artner
– Patrick Artner, Commented Jun 14, 2021 at 13:11
use set product instead, Take a look at 'set theory' , you will find set product. you can use that to generate one list and you can iterate through that with right interval — Wrench
– Wrench, Commented Jun 14, 2021 at 13:11

Tom Karzes · Accepted Answer · 2021-06-14 13:30:59Z

3

Use itertools.product to generate tuples of the desired indices. For example:

import itertools
for indices in intertools.product(range(num), repeat=depth):
    print(indices)

This will generate tuples of length depth of the values.

Here's a small example:

>>> for indices in itertools.product(range(3), repeat=2):
...     print(indices)
... 
(0, 0)
(0, 1)
(0, 2)
(1, 0)
(1, 1)
(1, 2)
(2, 0)
(2, 1)
(2, 2)
>>>

In this example, the number of values present in each tuple is 2, given by repeat=2.

edited Jun 14, 2021 at 13:30

answered Jun 14, 2021 at 13:10

Tom Karzes

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