How can i change position of value in numpy array?

how can i change position of green circle by coordinates(x, y) in numpy array?

import numpy as np
matrix = np.array(
    [
        ['🟢', '⬛', '⬛', '⬛'],
        ['⬛', '⬛', '⬛', '⬛'],
        ['⬛', '⬛', '⬛', '⬛'],
        ['⬛', '⬛', '⬛', '⬛']
    ]
)

x, y = tuple(zip(*np.where(matrix=='🟢')))[0]
yield "\n".join("".join(x for x in i) for i in matrix)

>Solution :

You can set the old position to square and the new to circle:

old_pos = (0,0)
new_pos = (1,2)

def change_pos(matrix,old,new):
    matrix[old] = '⬛'
    matrix[new] = '🟢'
change_pos(matrix, old_pos, new_pos)
matrix

output:

array([['⬛', '⬛', '⬛', '⬛'],
       ['⬛', '⬛', '🟢', '⬛'],
       ['⬛', '⬛', '⬛', '⬛'],
       ['⬛', '⬛', '⬛', '⬛']], dtype='<U1')

using a class

If your goal is to make some kind of game, you should use a class for your board:

import numpy as np
class Matrix():
    def __init__(self, pos=(0,0), size=(3,3)):
        self.pos = pos
        self.matrix = np.empty(size, dtype='<U1')
        self.matrix[:,:] = '⬛'
        self.matrix[pos] = '🟢'
    
    def __repr__(self):
        return self.matrix.__repr__()
    
    def __str__(self):
        return self.matrix.__str__()
    
    def change_pos(self, new):
        self.matrix[self.pos] = '⬛'
        self.matrix[new] = '🟢'
        self.pos = new

example:

m = Matrix()
print(m)

m.change_pos((2,1))
print(m)