Okay so the code below is example code i have made to illustrate my problem, i'm new to python, I'm using 2.7 and i have searched quite a lot with no success. The code all works except for one issue.
My problem is the object (Test) attribute Nested_list's that is printed at the end shows that the for loop that adds +1 to the first item in each list instead adds +1 to the first item in all 3 lists. i know the method i'm using would work on a normal list but for objects it's not quite right.
class Test(object):
def __init__(self):
self.nested_lists = [[0]*10]*3
object_holder = [[]]*30
for x in xrange(0, 30):
object_holder[x] = Test()
for objects in xrange(0, 30):
for lists in xrange(0, 3):
for items in xrange(0, 10):
object_holder[objects].nested_lists[lists][items] += 1
object_holder[1].nested_lists[0][8] += 5
object_holder[1].nested_lists[2][5] += 12
print object_holder[1].nested_lists
print object_holder[1].nested_lists[0]
print object_holder[1].nested_lists[0][8]
print object_holder[1].nested_lists[2][5]
print object_holder[2].nested_lists
print object_holder[2].nested_lists[0]
print object_holder[2].nested_lists[0][8]
print object_holder[2].nested_lists[2][5]
result
[[3, 3, 3, 3, 3, 15, 3, 3, 8, 3], [3, 3, 3, 3, 3, 15, 3, 3, 8, 3], [3, 3, 3, 3, 3, 15, 3, 3, 8, 3]]
[3, 3, 3, 3, 3, 15, 3, 3, 8, 3]
8
15
[[3, 3, 3, 3, 3, 3, 3, 3, 3, 3], [3, 3, 3, 3, 3, 3, 3, 3, 3, 3], [3, 3, 3, 3, 3, 3, 3, 3, 3, 3]]
[3, 3, 3, 3, 3, 3, 3, 3, 3, 3]
3
3
why is this? When it seems I can use print to target individual list's and items?? I have looked at getattr and setattr but i cant find anything on targeting nested lists with this method.
This shows when I try to target a specific item that it is possible, but for some reason which list I target is not definable? The result I was expecting would be every item equalling 1, except the individual items I added 5 and 12 to. Any help would be greatly appreciated
