How to use an array index to update a value in array.The compiler keep mention Index Error:list assignment index out of range.
Array Value before change:
[10,0,9,1]
Array value after update:
[9,0,9,1]
x = int(input("Input a number"))
drinkstock = [10,0,9,1]
z=int(drinkstock[x]-1)
for y in drinkstock:
if drinkstock.index(y)==x:
drinkstock[y]=z
print(y)
The for y in drinkstock allows you to access each number inside the array drinkstock.
So you would get:
y = 10 #first iteration
y = 0 #second iteration
y = 9 #third iteration
y = 1 #fourth iteration
So then when you do:
drinkstock[y] = z
you are trying to access the 10th index in drinkstock which does not exist.
Instead, you can do:
for i in range(len(drinkstonk)):
drinkstonk[i] = z
Not sure why you are trying to loop through the entire array though since it looks like you only updated one index value.
[9,0,9,1], and so, it should be if i==x: drinkstonk[i] = z inside the for-loop. And the last line should be print(drinkstonk) instead of print(y)cause this list length is 4 is's index just can choose from 0-3.
maybe you can do this
x = int(input("Input a number"))
drinkstock = [10,0,9,1]
if x in drinkstock:
index = drinkstock.index(x)
drinkstock[index] = x-1
print(drinkstock)
use list.index() to get x's index in drinkstock to update value
[10,0,10,1] and if the input value happens to be 2 then it would print [9,0,10,1] instead of [10,0,9,1].
drinkstock[x]=z?