# Continue prompting user input until 0 is key in

i’m having problem with my code. Not sure how to fix it. My program repeatedly prompts for the supermarket aisle numbers to visit. When 0 is entered, the input process will terminate. Then the program computes the minimum distance based on the best location to place the shopping basket and the number of aisles I need to pick items from. The program then displays the minimum distance. The following are my code:

```totalAisles = int(input("Enter the number of aisles in supermarket: "))
visitAisle = int(input("Enter the aisle number to visit: "))
if visitAisle == 0:
print("Not visiting any aisle")
else:
aisle = []
while True:
visitAisle = int(input("Enter the aisle number to visit: "))
if visitAisle == 0:
break
else:
for i in range(totalAisles):
visitAisle = int(input("Enter the aisle number to visit: "))
aisle.append(visitAisle)
#to find the best aisle to place the basket
highestAisle = max(aisle)
lowestAisle = min(aisle)
basket = round(highestAisle + lowestAisle) / 2
minimumDistance += abs(basket - visitAisle) * 2
print(f"The minimum distance is {minimumDistance} units")
```

Example runs

Run 1 Enter number of aisles in supermarket: 100

Enter the aisle number to visit: 1

Enter the aisle number to visit: 8

Enter the aisle number to visit: 5

Enter the aisle number to visit: 4

Enter the aisle number to visit: 10

Enter the aisle number to visit: 0

The minimum distance is 26 units

Run 2

Enter number of aisles in supermarket: 100

Enter the aisle number to visit: 1

Enter the aisle number to visit: 0

The minimum distance is 0 units

Run 3

Enter number of aisles in supermarket: 100

Enter the aisle number to visit: 0

Not visiting any aisle

UPDATED Here is a more streamlined way of doing it. I also made sure the user doesn’t enter duplicate aisle numbers and not more aisles than there are in the store. Most importantly, the computation step is much simplified.

```totalAisles = int(input("Enter the number of aisles in supermarket: "))
aisle = []
visitAisle = None

while len(aisle) < totalAisles:
visitAisle = int(input("Enter the aisle number to visit: "))
if visitAisle == 0:
if aisle:
break
else:
print("Not visiting any aisle")
break
if visitAisle not in aisle and visitAisle != 0:
aisle.append(visitAisle)
else:
print("You already entered that aisle number. Pick another one.")

#to find the best aisle to place the basket
if aisle:
highestAisle = max(aisle)
lowestAisle = min(aisle)
basket = (highestAisle + lowestAisle) //2

#traveling back and forth from the basket to each isle
minimumDistance = 0
for visitAisle in aisle:
minimumDistance += abs(basket - visitAisle) * 2
print(f"nThe minimum distance is {minimumDistance} units if you park the cart at aisle {basket}")
```