can you tell how it works please

Question

T = [[3-i for i in range (3)] for j in range (3)]
s = 0
for i in range(3):
s += T[i][i]
print(s)
(output = 6) can you explain

Answer 1

s sums up the numbers in T[i][i].

On the first iteration of the loop, s will become s = s + T[0][0], which is s = s + 3 when we look at T.

On the next iteration, we will add the next number to s and s will be s = s + T[1][1] and so forth

Answer 2

Great you could solve it!

Answer 3

You asked the same question yesterday and I recommended you to put the code in a script on sololearn playground and print out the steps.

Print T and print i and s and T[i][i] on each iteration.

Answer 4

Thank you for answering my questions
I did understand how to find i and T but I did not understand how to find s I tried the way you said, but I still not understanding.

Answer 5

okay I got it thank you again!