In Python, how would I iterate over a 2d array for true values?

Question

I have a 2d list of board positions where some are true some are false.

I want to iterate through them all while still having the indexes inside the nest.

aka:

for x,y in 2darray:
   if 2darray[x][y] == true: print x,y

What exactly is 2darray? A list of lists (that is not an array) or some sort of numpy array? — juanpa.arrivillaga
– juanpa.arrivillaga, Commented Jan 28, 2017 at 3:50

Mohsen_Fatemi · Accepted Answer · 2017-01-28 03:56:12Z

2

lets assume the name of 2darray is x

for i in range(len(x)):
    for j in range(len(x[i])):
        if x[i][j] == true :
             print (i,j)

answered Jan 28, 2017 at 3:56

Mohsen_Fatemi

3,4212 gold badges21 silver badges32 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Robin Curbelo · Accepted Answer · 2017-01-28 04:56:14Z

1

if l is your 2darray, then you can do the following

for i, j in [(i, j) for i in xrange(len(l)) for j in xrange(len(l[i]))]:
    if l[i][j]:
        print (i, j)

answered Jan 28, 2017 at 4:24

Robin Curbelo

1,3411 gold badge11 silver badges21 bronze badges