How do I convert this list into a couple of strings?

Question

I have this code that adds the sum of rows in a matrix:

matrix = [[1,1,1],[1,2,2],[1,0,0]]
answer = str([sum(row) for row in matrix])
print answer

But answer is a string that looks like [3, 5, 1].

How can I convert answer to be x variables using a loop (without .join)?

Example if answer = [3, 5, 1] It should be :

answer1 = "3"

answer2 = "5"

answer3 = "1"

Answer is not a `string` it is a python array. It is becomes a string when you print it, because `print` can only print strings. Just loop over the array and you're done! — Svaberg, Mar 26 '17 at 02:23

Alex Fung · Answer 1 · 2017-03-26T02:55:52.060

0

This is what you want:

matrix = [[1,1,1],[1,2,2],[1,0,0]]
answer1,answer2,answer3 = [str(sum(row)) for row in matrix]
print (answer1)
print (answer2)
print (answer3)

Output:

3
5
1

If you would like to use dict:

matrix = [[1,1,1],[1,2,2],[1,0,0]]
answer = {index:str(sum(row)) for index,row in enumerate(matrix)}
print(answer)

Output:

{0: '3', 1: '5', 2: '1'}

Alternatively you can use a list to store the answers:

matrix = [[1,1,1],[1,2,2],[1,0,0]]
answer = [str(sum(row)) for row in matrix]
print(answer)

Output:

['3', '5', '1']

You can refer to answer 0 with answer[0]

edited Mar 26 '17 at 02:55

answered Mar 26 '17 at 02:14

Alex Fung

Hi Alex, it is true, but what if each matrix row in my matrix had a different amount of "answers", how can I do the same but with a loop? What if `Matrix = [[1,1,1,5,1],[1,2,2,5,6],[1,0,0,2,5]]` – John Finkelstein Mar 26 '17 at 02:29
I would suggest you to use a dictionary to store the answers. – Alex Fung Mar 26 '17 at 02:37
Could you edit your answer to show how can I use a dictionary to store the answers? – John Finkelstein Mar 26 '17 at 02:38
@JohnFinkelstein done – Alex Fung Mar 26 '17 at 02:43

score -1 · Answer 2 · answered Mar 26 '17 at 02:06

-1

If you actually want variables answer1 answer2 and answer3 to equal the answers, simply do this

for i in answer:
    temp='answer'+str(i+1)+' = str(answer['+str(i)+'])'
    exec(temp)

answered Mar 26 '17 at 02:06

Phonzi

Please read the question and edit your answer. `exec` is unnecessary for this simple task. – Alex Fung Mar 26 '17 at 02:20
@AlexFung I would argue that `exec` is necessary if the amount of numbers in the answer is not specified. The question never specified that it had to be three numbers. It just used three as an example. They also requested that the values be stored as variables. This is why I didn't use a list or dictionary which would be simpler. – Phonzi Mar 26 '17 at 15:49

2 Answers2