我的程序一直在循环，我不知道为什么

Question

用户需要输入包裹重量，在我输入包裹后，它会给我正确的答案，但答案不断重复。

代码如下：

more = "y"

count = 0

total = 0
x = 0


while(more == "y"):
    lbs = eval(input("Please enter the weight of the package: "))

    if (lbs >= 1 and lbs <= 2):
        op1:(lbs * 1.10)
        x = op1
        count += 1
        total += x
        print("The current package shipping cost is:",op1)

    if (lbs > 2 and lbs <= 6):
        op2 = (lbs * 2.20)
        x = op2
        count += 1
        total += x
        print("The current package shipping cost is:",op2)

    if (lbs > 6 and lbs <= 10):
        op3 =(lbs * 3.70)
        x = op3
        count += 1
        total += x
        print("The current package shipping cost is:",op3)


    if (lbs > 10):
        op4 =(lbs * 3.80)
        x = op4
        count += 1
        total += x
        print("The current package shipping cost is:",op4)

    if (lbs == 0):
        print("your package cannot be delivered")

    more = input ("Do you want to enter another Package? <y/n>: ")
while(more == "n"):
    print("Your total shipping cost is:",total,"for",count,"packages")

Answer 1

这一行-

while(more == "n"):
     print("Your total shipping cost is:",total,"for",count,"packages")

您不需要while循环。就这么做-

print("Your total shipping cost is:",total,"for",count,"packages")

此外，您不需要eval()，只需使用int() -

lbs = int(input("Please enter the weight of the package: "))

您可以使用range()函数而不是>= <= ...诸如此类。例如：

if lbs in range(1,2+1): # Not really useful, still you could use this
    # code

它并不重要，因此为了保持简单，您不需要使用range函数

Answer 2

你为什么不直接从

while True:

并在每个if求值后放置一个break，那么您只会得到正确的输入，如果输入不正确，while循环将再次从输入问题开始。输入问题还需要权重需要为磅的信息。

Answer 3

既然你删除了之前关于你的代码给你的错误和函数不是working...here的问题，我将解释你的错误和新程序。

1.您的第一个错误是您使用了def greeting函数，并且您没有完成该函数，并且您必须在调用函数时定义该函数应该执行的操作。您使用了def Greeting():，但没有完成它，如果您使用的是def函数，则必须在()之后完成它：

2.第二个错误是while循环不是correct.It有一些逻辑错误

3.你的第三个错误是你的函数(op1.op2，op3，op4)的格式是错误的，这就是为什么你的程序不能像你期望的那样工作

在这里，我更新了你在10月22日提出的前一个问题，2021...please，检查一下这段代码，并将它与你的代码进行比较，了解你的错误。

祝你好运，朋友，永远从错误中吸取教训：)

新代码：

def Greeting():
    print('good morning')
Greeting()
n=str(input("please input full name: "))
print("hello",n,"this program will allow you to input package weight and display price")


package_count=0 
total=0  
more=False
while more==False:
    more = input ("Do you want to enter another Package? <y/n>: ")
    if(more == "y"):
        lbs = int(input("Please enter the weight of the package: "))
    else:
        print('your total shipping cost is:',total,"for",package_count,'packages')
        break
if (lbs>=1 and lbs<=2):
        op1=(lbs*1.10)
        print('The current package shipping cost is: ',op1)
        package_count=package_count+1
        total=op1

elif(lbs>2 and lbs<=6):
    op2 = (lbs * 2.20)
    print('The current package shipping cost is:',op2)
    package_count=package_count+1
    total=total+op2

elif(lbs > 6 and lbs <= 10):
    op3 =(lbs * 3.70)
    print("The current package shipping cost is:",op3)
    package_count=package_count+1
    total=total+op3

elif(lbs>10):
    op4=(lbs*3.80)
    print("The current package shipping cost is:",op4)
    package_count=package_count+1
    total=total+op4


else:
    print("your package cannot be delivered")
more=False