如果输入数字0，如何结束while循环并遵循其他说明

Question

My code puts all of he users entered items into aa list I want it to stop when 0 is entered and follow the other commans such as sorting the list, deleting the highest and lowest values and then finding the average of them Here is the Code so far:

i = 0
sizes = []
while i == 0:
    size = int(input("Enter the weight of your parcel in grams, enter 0 when done: "))
    sizes.append(size)
    if size < 1:
        break
sortedsizes = sorted(sizes)
largest = max(sizes)
smallest = min(sizes)
sizes.remove(largest)
sizes.remove(smallest)
print(sizes)

Answer 1

You do not need i and you do not want packages that weight less the 0. You might want to consider using float instead of int - where I live we measure kg for packages or g for letters - both will be taken including fractions ( 1.235kg or 5.28g).

If someone inputs "22kg" any number conversion will crash - you should guard against it:

sizes = []
while True:
    try:
        size = int(input("Enter the weight of your parcel in grams, enter 0 when done: "))
        if size > 0:  
            sizes.append(size)
        elif size == 0:
            break
        else:
            raise ValueError()  # negative weight
    except ValueError:
        print("Only positive numbers or 0 to quit. Do not input text or kg/g/mg.")

sortedsizes = sorted(sizes) # you do nothing with this - why sort at all?
largest = max(sizes)
smallest = min(sizes)
sizes.remove(largest)
sizes.remove(smallest)
print(sizes)  # this prints the unsorted list that got min/max removed...

Output:

Enter the weight of your parcel in grams, enter 0 when done: 4 
Enter the weight of your parcel in grams, enter 0 when done: 3 
Enter the weight of your parcel in grams, enter 0 when done: 5 
Enter the weight of your parcel in grams, enter 0 when done: 6 
Enter the weight of your parcel in grams, enter 0 when done: -1 
Only positive numbers or 0 to quit. Do not input text or kg/g/mg.
Enter the weight of your parcel in grams, enter 0 when done: DONE 
Only positive numbers or 0 to quit. Do not input text or kg/g/mg. 
Enter the weight of your parcel in grams, enter 0 when done: 2 
Enter the weight of your parcel in grams, enter 0 when done: 0

[4, 3, 5]  # this is the unsorted list that got min/max removed...

---

If you want to remove only 1 maximal and 1 minimal value from the sorted list you can simplyfy it:

sortedsizes = sorted(sizes)  
maxval = sortedsizes.pop()    # remove last one from sortedsizes  (== max)
minval = sortedsizes.pop(0)   # remove first one from sortedsizes (== min)
print(sortedsizes)            # print the sorted values

Doku:

• pop() doku
• try: catch: error handling

Answer 2

if you want your code to stop(appending sizes to your list and continue with the commands after the repetitive procedure ) when 0 is entered, you have to do the opposite action.

while True:
    size = int(input("Enter the weight of your parcel in grams, enter 0 when done: "))
    sizes.append(size)
    if size < 1:
        break

While the statement is false, the code continues from the sortedsizes = sorted(sizes) command.