How To Fix "list assignment index out of range"

Question

Im trying to use a counter and an list to input a size then store it, but im hit with

list assignment index out of range

even thou range is set to the value of counter

while  counter < P_Ammount:
    P_Size[counter] = input("Enter A Size S= Small M= Meduim L= Large ")
    if P_Size[counter] == "S" or P_Size[counter] == "s": # both types of valadation for Lower and upper case
        P_Size_Cost[counter] = 3.25 #Setting Price To List for Small

    if P_Size[counter] == "M" or P_Size[counter] == "m":
        P_Size_Cost[counter] = 5.50 #Setting Price To List for Meduim

    if P_Size[counter] == "L" or P_Size[counter] == "l":
        P_Size_Cost[counter] = 7.15 #Setting Price To List for Large

        counter + 1

Answer 1

counter = 0
P_Size = []
P_Size_Cost = dict()
while  counter < P_Ammount:
    size = input("Enter A Size S= Small M= Meduim L= Large ")
    P_Size.append(size)

    if P_Size[counter] == "S" or P_Size[counter] == "s": # both types of valadation for Lower and upper case
        P_Size_Cost[counter] = 3.25 #Setting Price To List for Small

    if P_Size[counter] == "M" or P_Size[counter] == "m":
        P_Size_Cost[counter] = 5.50 #Setting Price To List for Meduim

    if P_Size[counter] == "L" or P_Size[counter] == "l":
        P_Size_Cost[counter] = 7.15 #Setting Price To List for Large

    counter = counter + 1