I am creating a list with several sub-lists and sub-sub-lists like so:
a = [0.1, 0.2, 0.4, 0.8, 1.2]
b = [[]] * 3
c = [[]] * 4
# Final list.
d = [[b, c]] * len(a)
I need to create it this way because it depends on the length of various other lists, this is just a simplified example.
When I try to append a single element to d:
d[0][0][0].append(a[2])
I get the same element repeated throughout the list:
[[[[0.4], [0.4], [0.4]], [[], [], [], []]], [[[0.4], [0.4], [0.4]], [[], [], [], []]], [[[0.4], [0.4], [0.4]], [[], [], [], []]], [[[0.4], [0.4], [0.4]], [[], [], [], []]], [[[0.4], [0.4], [0.4]], [[], [], [], []]]]
I understand this is a problem with how I'm creating d but I'm not sure how can I prevent this behaviour.
