What is the output of the following Python program?mylist = [ [2,4,1], [1,2,3], [2,3,5] ]a=0total = 0while a < 3: b = 0 while b < 2: total += mylist[a][b] b += 1 a += 1print(total)
Question
What is the output of the following Python program?mylist = [ [2,4,1], [1,2,3], [2,3,5] ]a=0total = 0while a < 3: b = 0 while b < 2: total += mylist[a][b] b += 1 a += 1print(total)
Solution
The output of the Python program is 14.
Here's how:
- The program initializes two variables,
aandtotal, to 0. - It then enters a while loop that runs as long as
ais less than 3. - Inside this loop, it initializes
bto 0 and enters another while loop that runs as long asbis less than 2. - Inside this inner loop, it adds the value of
mylist[a][b]tototal. For the first iteration,mylist[a][b]ismylist[0][0], which is 2. For the second iteration,mylist[a][b]ismylist[0][1], which is 4. So after the first two iterations,totalis 6. - It then increments
bby 1 and repeats the inner loop. This time,mylist[a][b]ismylist[1][0], which is 1, andmylist[1][1], which is 2. So after these iterations,totalis 9. - It then increments
aby 1 and repeats the outer loop. This time,mylist[a][b]ismylist[2][0], which is 2, andmylist[2][1], which is 3. So after these iterations,totalis 14. - Finally, it prints the value of
total, which is 14.
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