如何退出 if 語句和 go 回到開頭

Question

我有幾個 if 語句，但如果第一個輸入為假，它仍然會 go 進入下一個 if 語句，而不是回到該 if 語句的開頭並重新開始。

下面的代碼

 # check the weight of a single parcel
while True:
    pweight = float(input('How much does your parcel weigh in kg? '))
    if pweight > 10:
        print('Sorry the parcel is to heavy')
    elif pweight < 1:
        print('Sorry the parcel is to light')
    else:
        break
print('----------------------------------------------')
while True:
    height1 = float(input('Enter the parcel height in cm: '))
    if height1 > 80:
        print('Sorry, Your height is too large')
    else:
        break
print('----------------------------------------------')
while True:
    width1 = float(input('Enter the parcel width in cm: '))
    if width1 > 80:
        print('Sorry, Your width is too large')
    else:
        break
print('----------------------------------------------')
while True:
    length1 = float(input('Enter the parcel length in cm: '))
    if length1 > 80:
        print('Sorry, Your length is too large')
    else:
        break
print('----------------------------------------------')
while True:
    if (height1 + width1 + length1) > 200:
        print('Sorry, the sum of your dimensions are too large')
    else:
        print('Your parcels dimensions are', height1, 'x', width1, 'x', length1)
        print('Your parcel has been accepted for delivery, many thanks for using our service :)')
    break

例如，如果輸入的重量為 11 或身高大於 80，則應始終 go 回到開頭並詢問重量。 **如果不滿足任何條件，我需要將它 go 回到開頭並再次詢問重量。 ** 程序應重新啟動並再次詢問重量。

Answer 1

用一個 while True 循環代替所有問題。 除了中斷之外，您還必須在要從頭開始重新開始問題的條件下使用continue 。

# check the weight of a single parcel
while True:
    pweight = float(input('How much does your parcel weigh in kg? '))
    if pweight > 10:
        print('Sorry the parcel is to heavy')
        continue
    elif pweight < 1:
        print('Sorry the parcel is to light')
        continue
    print('----------------------------------------------')
    height1 = float(input('Enter the parcel height in cm: '))
    if height1 > 80:
        print('Sorry, Your height is too large')
        continue
    print('----------------------------------------------')
    width1 = float(input('Enter the parcel width in cm: '))
    if width1 > 80:
        print('Sorry, Your width is too large')
        continue
    print('----------------------------------------------')
    length1 = float(input('Enter the parcel length in cm: '))
    if length1 > 80:
        print('Sorry, Your length is too large')
        continue
    print('----------------------------------------------')
    if (height1 + width1 + length1) > 200:
        print('Sorry, the sum of your dimensions are too large')
        continue
    else:
        print('Your parcels dimensions are', height1, 'x', width1, 'x', length1)
        print('Your parcel has been accepted for delivery, many thanks for using our service :)')
        break