What is the Python syntax for a general nested for loop? [closed]

You can rewrite it to be like this:

def update_grid():
    for i in range(5):
        for j in range(i, 5):
            # do whatever you want with i and j

And here is a proof of concept of the code above:

>>> for i in range(5):
...     for j in range(i, 5):
...             print((i, j))
... 
(0, 0)
(0, 1)
(0, 2)
(0, 3)
(0, 4)
(1, 1)
(1, 2)
(1, 3)
(1, 4)
(2, 2)
(2, 3)
(2, 4)
(3, 3)
(3, 4)
(4, 4)
>>>