performance - Efficient implementation for iterating over a list and updating a dictionary

Question

Is there any efficient implementation for iterating over a list and updating the corresponding value in a dictionary? What I want to do is shown in the code below:

for i in range(n):
    
    for j in range(i+1, n):
        
        update( dict[ (data[i], data[j]) ] )

Clearly update is a function and data is a list.

question from:https://stackoverflow.com/questions/65865721/efficient-implementation-for-iterating-over-a-list-and-updating-a-dictionary

Answer 1

Waitting for answers