Select a random element from a 2d array list in python

Question

I currently have a 2d array generated by this code:

for y in range(width):
    self.grid.append([])
    for x in range(width):
        self.grid[y].append(Cell(x, y))

If I want to select a random cell, how would I go about it? random.choice doesn't seem to be working.

Pick a random x value, a random y, and your random cell will be self.grid[random_x][random_y]. You can use random.randint or random.randrange to do so. — julienc
– julienc, Commented Jan 24, 2021 at 9:31
Does this answer your question? How to pythonically select a random index from a 2D list such that the corresponding element matches a value? — Pygirl
– Pygirl, Commented Jan 24, 2021 at 9:34

Lukas Schmid · Accepted Answer · 2021-01-24 09:32:03Z

2

You could do something like

yCoord = random.randrange(width)
xCoord = random.randrange(width)
randomCell = self.grid[yCoord][xCoord]

If you do want to use random.choice, you'll have to use it twice, as the first call will return an array of Cells, then the second one will return a cell element.

answered Jan 24, 2021 at 9:32

Lukas Schmid

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Shambhav · Accepted Answer · 2021-01-24 09:37:07Z

0

You can use:

s = list[random.randint(0, len(list) - 1]
rn = s[random.randint(0, len(s) - 1]

You need to use double lines as you need to find the length of the sublist. I don't know or think any direct way exists.

answered Jan 24, 2021 at 9:37

Shambhav

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