我对Python还比较陌生,我正在编写一个程序,可以将一个七位数的数字转换成一个GTIN-8代码,还带有一个校验位。它允许我运行它,但在我输入我的号码后,它会给我一个错误:
IndexError: String index out of range
我的代码如下:
sevenNum = ""
gtinNum = ""
checkDigit = ""
total = ""
a = 0
b = 0
c = 0
d = 0
e = 0
f = 0
g = 0
def GTINCalc():
a = int(sevenNum[0])*3
b = int(sevenNum[1])*1
c = int(sevenNum[2])*3
d = int(sevenNum[3])*1
e = int(sevenNum[4])*3
f = int(sevenNum[5])*1
g = int(sevenNum[6])*3
total = int(a+b+c+d+e+f+g)
checkDigit = (total + 9) // 10 * 10 - total
print("GTIN-8 Code: {0}{1}{2}{3}{4}{5}{6}{7}".format(a, b, c, d, e, f, g, checkDigit))
def sevenNumAsk():
sevenNum = input("Enter a 7 digit number to be converted into a GTIN-8 Number")
if sevenNum.isdigit() == True and len(sevenNum) == 7:
print("Valid Number - Calculating GTIN-8...")
GTINCalc()
else:
print("The number is not valid - please re-enter ")
sevenNumAsk()
sevenNumAsk()
突出显示的部分是:
a = int(sevenNum[0])*3
感谢您的帮助。谢谢
sevenNum
是sevenNumAsk
内部的局部变量,不影响在顶部创建的全局变量。请执行以下操作:它会像你所期望的那样。更好的方法是使用类或pass
sevenNum
作为参数。全局变量通常是不好的,这也是原因之一相关问题 更多 >
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