I have 2 lists, for example: [1, 2, 3] and [4, 5, 6] How do I merge them into 1 new list?: [1, 2, 3, 4, 5, 6] not [[1, 2, 3], [4, 5, 6]]
2 Answers
+ operator can be used to merge two lists.
data1 = [1, 2, 3] data2 = [4, 5, 6] data = data1 + data2 print(data) # output : [1, 2, 3, 4, 5, 6] Lists can be merged like this in python.
Building on the same idea, if you want to join multiple lists or a list of lists to a single list, you can still use "+" but inside a reduce method like this,
from functools import reduce l1 = [1, 2, 3] l2 = [4, 5, 6] l3 = [7, 8, 9] l4 = [10, 11, 12] l = [l1, l2, l3, l4] data = reduce(lambda a, b: a+b, l) print(data) # output : [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12] 
Comments
By using the + operator, like this:
>>> [1, 2] + [3, 4] [1, 2, 3, 4] 
l1 + l2. You can simply add them.[1, 2, 3] + [4, 5, 6]that's it.arraymodule I linked above, plus Numpy arrays, I think it's important to give these things their correct names.