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

Don't assign local variables in lists. In the loop

for i in lis:
    i = 5

Just sets the variable i to 5 and leaves the actual contents of the list unchanged. Instead, you have to assign it directly:

for i in range(len(lis)):
     lis[i] = 5

The same applied for lists of lists, although in this case the local variable doesn't have to be assigned so you can use the for...in construct.

for i in listoflists:
     for i2 in range(len(i)):
          i[i2] = 5 #sets all items in all lists to 5