How to go through each elementin a list and update them?

Question

For example, I have the list:

list1[]= [0.75, 0.29, 0.3]

And i want to create a function that goes through each element and multiplies them by 2 and updates the list (or saves it as a new list)

Answer 1

You can use this code snippet

def update(lst):
    nl=[]
    for i in lst:
        nl.append(i*2)
    return nl

Answer 2

Use a list comprehension:

list1 = [0.75, 0.29, 0.3]
list1 = [i * 2 for i in list1]