在while循环中列出超出范围的索引

Question

I'm trying to implemnt Minesweeper game , but i'm stuck , i'm getting the list out of range error and i don't where i did wrong

def Int_jeu(largeur,longueur,diff):
global n, m,T
dif = diff

n=largeur
m=longueur
T = [[0 for i in range(n)] for j in range(m)]


d=((n*m)*dif)//100
print(len(T[0]))
for i in  range(d):
    a=random.randint(0,len(T)-1)
    b=random.randint(0,len(T[0])-1)


    while (T[a][b] == "2"):

        a=random.randint(0,n-1)
        b=random.randint(0,m-1)

    T[a][b] = "2"


return(T)

this is the line where i got the error

  while (T[a][b] == "2"):

i have declared the matrix T out of the int_jeu function

T = []

can anyone explain me why i get the error please.

Answer 1

m is your first dimension, n is your second, but a is used to index the first dimension ( m ) while being derived from n (same for b , in reverse).

Change:

    a=random.randint(0,n-1)
    b=random.randint(0,m-1)

to:

    a=random.randint(0,m-1)  # Or to simplify, random.randrange(m)
    b=random.randint(0,n-1)  # Or to simplify, random.randrange(n)

to fix.