Am 11.08.2016 um 23:49 schrieb Gary Herron:
On 08/11/2016 03:06 PM, Mok-Kong Shen wrote:

def test(list1,list2):
  list1+=[4,5,6]
  list2=list2+[4,5,6]
  print("inside ",list1,list2)
  return
[snip]

# With

list1=[1,2,3]
list2=[1,2,3]
test(list1,list2)
print("outside",list1,list2)

# I got the following:
# inside  [1, 2, 3, 4, 5, 6] [1, 2, 3, 4, 5, 6]
# outside [1, 2, 3, 4, 5, 6] [1, 2, 3]
[snip]

In this next example, there are two separate lists:

list1 = [1,2,3]
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.

M. K.

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