Return a list inside a for loop while iterating over the elements of another list

Question

When I run the following code:

for elems1 in L1:
   ---some-actions---
   for val in value:
      result = val1,val2,val3
      L2.append(result)
      print(L2)

   #additional tasks 
   for vals in L2:
        ---additional-tasks to be performed---

And print (L2) I get the output as :

['val1']
['val1','val2'] 
['val1','val2','val3'] 

I need to iterate over the values of these two lists in nested for loops but it is printing thrice and separating each value. why?

Answer 1

The print() is getting called multiple times as it is inside the loop. Put it outside the loop as such :

for val in value:
      result = val1,val2,val3
      L2.append(result)
print(L2)