+ 2

Taking a list of lists and adding the items of another list to each individual list in the list of lists? ... (Bear with me)

(Python3) Trying to take list a = [3,2,1] And adding it to the items in the list of lists b = [[1,2,3] , [4,5,6]] To get a new list of lists c = [[4,4,4] , [7,7,7]] Help?

28th May 2018, 4:42 PM
Jordan Pagé
Jordan Pagé - avatar
2 odpowiedzi
+ 6
Here's a fairly simple way to do it; a = [3,2,1] b = [[1,2,3], [4,5,6]] c = [] for sublist in b: d = [] for index, val in enumerate(sublist): d.append(val+a[index]) c.append(d) print(c)
28th May 2018, 5:05 PM
ChaoticDawg
ChaoticDawg - avatar
+ 4
Another way is to use numpy arrays instead of lists. Take a look at the numpy module: https://www.sololearn.com/learn/6671/ Then, doing a + b will return a new array with the values summed elementwise. If you’ll be doing this opperation too often, you should probably go with numpy.
28th May 2018, 7:12 PM
Pedro Demingos
Pedro Demingos - avatar