##### How to change odd to even numbers in the list?
 How to change odd to even numbers in the list? plumberpy Silly Frenchman Posts: 36 Threads: 11 Joined: Aug 2021 Reputation: Aug-08-2021, 05:34 AM Newbie here. Struggling with this simple problem. x2=[[2,4,6],[1,3,5],[7,8,9]] Want to change to x2=[[2,4,6],[2,4,6],[8,8,10]] A. Change odd numbers to the next available even numbers, i.e., 1 to 1+1, 3 to 3+1 etc. B. x2[0] will give me the 1st list. How can I get the individual numbers in that list? Thanks. Reply Posts: 1,587 Threads: 1 Joined: Apr 2017 Reputation: Aug-08-2021, 05:38 AM Use a for loop/compression? Reply plumberpy Silly Frenchman Posts: 36 Threads: 11 Joined: Aug 2021 Reputation: Aug-08-2021, 05:50 AM (Aug-08-2021, 05:38 AM)ndc85430 Wrote: Use a for loop/compression?Thanks. Appreciate more infor. My plan is to look at each number in the lists and then do the odd to even number correction. But cannot extract the individual numbers, but the whole lists. Reply Posts: 1,587 Threads: 1 Joined: Apr 2017 Reputation: Aug-08-2021, 06:25 AM Are you not allowed to look at the individual values in the list? If not, why not? If you are, then do you know how to use a for loop or comprehension? If not, look those things up. Reply ibreeden Minister of Silly Walks Posts: 409 Threads: 0 Joined: Aug 2019 Reputation: Aug-08-2021, 07:31 AM Hi @plumberpy, Please read the tutorial of lists. The last example of this chapter 3.1.3 answers your question. Reply plumberpy Silly Frenchman Posts: 36 Threads: 11 Joined: Aug 2021 Reputation: Aug-08-2021, 09:40 AM (Aug-08-2021, 07:31 AM)ibreeden Wrote: Hi @plumberpy, Please read the tutorial of lists. The last example of this chapter 3.1.3 answers your question. Noted and thanks. The trick is to use x[ ] [ ] to get the required data for a list within a list. Did not know that. Too used to x( , ) format. Maybe future Python upgrade can simplify the syntax to x[ , ]. Ha. I will play around with x[ ] [ ] to solve my problem. Many thanks. Reply plumberpy Silly Frenchman Posts: 36 Threads: 11 Joined: Aug 2021 Reputation: Aug-08-2021, 09:43 AM (Aug-08-2021, 06:25 AM)ndc85430 Wrote: Are you not allowed to look at the individual values in the list? If not, why not? If you are, then do you know how to use a for loop or comprehension? If not, look those things up. Thanks. Tried out a comprehension example. It works for strings but I cannot get it to do what I want with the numbers in the second layer in a list. Cheerio. Reply menator01 Verb Conjugator Posts: 552 Threads: 68 Joined: Sep 2019 Reputation: Aug-08-2021, 10:40 AM here is one way ```#! /usr/bin/env python3 x = [[2, 4, 6], [1, 3, 5], [7, 8, 9]] for inner_list in x: for num in range(0, len(inner_list)): if inner_list[num] % 2 != 0: inner_list[num] = inner_list[num] + 1 print(x)`````Output:[[2, 4, 6], [2, 4, 6], [8, 8, 10]]`` I welcome all feedback. The only dumb question, is one that doesn't get asked. My Scripts CookBook - Shmup - PyQt5 Music Player Reply plumberpy Silly Frenchman Posts: 36 Threads: 11 Joined: Aug 2021 Reputation: Aug-08-2021, 11:07 AM (Aug-08-2021, 10:40 AM)menator01 Wrote: here is one way ```#! /usr/bin/env python3 x = [[2, 4, 6], [1, 3, 5], [7, 8, 9]] for inner_list in x: for num in range(0, len(inner_list)): if inner_list[num] % 2 != 0: inner_list[num] = inner_list[num] + 1 print(x)`````Output:[[2, 4, 6], [2, 4, 6], [8, 8, 10]]``Many many thanks! Yours is a lot simpler than what I have in mind. Cheerio. Reply

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