# Creating multiple sublists by performing an operation in Python

I have two lists `A2` and `Cb_new`. I am performing an operating as shown below. But I want to create multiple sublists instead of one single list. I present the current and expected outputs.

``````A2=[[2, 3, 5], [3, 4, 6]]

Cb_new=[[1.0, 0.0, 0.0, 0.9979508721068377, 0.0, 0.9961113206802571, 0.0, 0.0, 0.996111320680257, 0.0, 0.0]]
Cb=[]

for j in range(0,len(A2)):
for i in range(0,len(A2[j])):
Cb1=Cb_new[A2[j][i]]
Cb.append(Cb1)
print(Cb)
``````

The current output is

``````[0.0, 0.9979508721068377, 0.9961113206802571, 0.9979508721068377, 0.0, 0.0]
``````

The expected output is

``````[[0.0, 0.9979508721068377, 0.9961113206802571], [0.9979508721068377, 0.0, 0.0]]
``````

### >Solution :

You will need to use a temporary list to achieve this behavior. In your code Cb1 is always an element from Cb_new list. Instead, you should append it to a list that you reset at every iteration of outer for loop.

``````for j in range(0,len(A2)):
Cb_interm = []
for i in range(0,len(A2[j])):
Cb1=Cb_new[A2[j][i]]
Cb_interm.append(Cb1)
Cb.append(Cb_interm)
print(Cb)
``````

The output:

``````[[0.0, 0.9979508721068377, 0.9961113206802571], [0.9979508721068377, 0.0, 0.0]]
``````