Python - How to change values in a list of lists?

Question

I have a list of lists, each list within the list contains 5 items, how do I change the values of the items in the list? I have tried the following:

    for [ite         


        

Answer 1

The iterator variables are copies of the original (Python does not have a concept of a reference as such, although structures such as lists are referred to by reference). You need to do something like:

for item in execlist:
    if item[0] == mynumber:
        item[1] = ctype
        item[2] = myx
        item[3] = myy
        item[4] = mydelay

item itself is a copy too, but it is a copy of a reference to the original nested list, so when you refer to its elements the original list is updated.

This isn't as convenient since you don't have the names; perhaps a dictionary or class would be a more convenient structure.