Write a program that keeps track of a simple inventory for a store. While there are still items left in the inventory, ask the user how many items they would like to buy. Then print out how many are left in inventory after the purchase. You should use a while loop for this problem. A sample run is below. (CodeHS, PYTHON)

STARTING_ITEMS_IN_INVENTORY = 20

num_items = STARTING_ITEMS_IN_INVENTORY

# Enter your code here

while num_items > 0:

print("We have " + str(num_items) + " items in inventory")

toBuy = int(input("How many would you like to buy?"))

if toBuy > num_items:

print("There is not enough in inventory")

print("Now we have " + str(num_items) + " left")

else: # ok to sell

num_items = num_items - toBuy # update

if num_items > 0: # only for printing

print("Now we have " + str(num_items) + " left")

print("All out!")

Explanation:

This allows Python to store the number of items in inventory after each purchase by subtracting how much is bought with the toBuy function by how much is left. This continues until num_items is no longer greater than zero. If what’s toBuy goes above the # of items left in inventory, then the “if toBuy > num_items” segment of the code comes into play by telling the user there’s not enough and re telling them how much is left and how much they’d like to buy. When the items in inventory is out, meaning the exact amount that’s left is purchased, then Python prints “All out!”