How to update element of nested list from forloop - Python

Question

I'd like to update an element in a nested list from output in a loop. However, I can't figure out how to do so without clunky nested for-loops. I suspect use of zip will be necessary, but haven't figure out how to work it in.

I have an empty nested list that I want to fill as the loop progresses:

empty_list = [[], [], []]

I have a separate nested list, with the same number of elements as lists in empty_list:

lst = [[x], [y], [z]]

I would like to then generate some output from a loop for each element in lst. My desired result is:

no_longer_empty_list = [[[x], [output_x_1], [output_x_2]], 
[[y], [output_y_1], [output_y_2]], 
[[z], [output_z_1], [output_z_2]]]

where output_x_1 and output_x_2 are the outputs from the loop when the element being parsed in the loop is x (and the same for y and z)

Here is what I have constructed so far in pseudo-code:

for elem in lst:
    if condition holds:
       generate output_1
       append output_1 to appropriate spot in empty_list  
    elif other condition holds:
       generate output_2
       append output_2 to appropriate spot in empty_list

Where I am struggling is how to append the outputs to the right list in the empty_list.

Apologies if the syntax/explanation is confusing, I've tried to distill it to an understandable format, but will do my best to explain if it is still unclear

Answer 1

Let's assume you have 2 functions; generate_out1() and generate_out2() as well as a list with elements x, y, z, where each element can be a list.

result = []
lst = [x, y, z]

for elem in lst:
   temp = [elem]
   temp.append(generate_out1(elem))
   temp.append(generate_out2(elem))
   result.append(temp)