A strange list concatenation result

[Steven D'Aprano]

On Sat, 13 Aug 2016 06:44 am, Mok-Kong Shen wrote:

>>>>> list2 = [1,2,3]
>>>>> list1 += [4,5,6]
>>>>> print(list1, list2)
>> [1, 2, 3, 4, 5, 6] [1, 2, 3]
>>
>>
>> Does that help?
> 
> I don't yet understand why in my 2nd example list2 came out as
> [1, 2, 3] outside.

Because you assign list2 = [1, 2, 3]. What did you expect it to be?




-- 
Steve
“Cheer up,” they said, “things could be worse.” So I cheered up, and sure
enough, things got worse.