python - 我需要将每个其他数字乘以 3 但不知道我做错了什么

Question

print("Welcome")
barcode1 = input("Please enter your first digit")
barcode2 = input("Please enter your second digit")
barcode3 = input("Please enter your third digit")
barcode4 = input("Please enter your fourth digit")
barcode5 = input("Please enter your fifth digit")
barcode6 = input("Please enter your sixth digit")
barcode7 = input("Please enter your seventh digit")
barcode1 = barcode1*3
print(barcode1)

结果不是数字乘以 3，而是 111

Answer 1

你可以这样做:

codes = []
i = 0
while True:
    try:
        codes.append(int(input("Please input your Barcode {}: ".format(i))) * 3)
        if i == 6: break
        i += 1
    except ValueError:
        print("Something went wrong!")

print(codes)

在其周围添加一个 try-catch 语句，并尝试将您的输入转换为 int。有了它，您还可以输入一个字符串，但您的脚本不会崩溃。