Python：Int() Base 10 的无效文字
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Python: Invalid Literal for Int() Base 10
提问by Frontier
I'm writing code for a project to determine the validity of credit cards and i've hit a wall, it seems like all of the things i have tried so far are not working.
我正在为一个项目编写代码来确定信用卡的有效性，但我遇到了困难，到目前为止我尝试过的所有方法似乎都不起作用。
This is giving me an error for the sumofodds function where j=int(card[i])
这给了我一个 sumofodds 函数的错误，其中 j=int(card[i])
The error is "Invalid Literal for Int() with Base 10
错误是“Int() 的字面值无效，基数为 10
Is there anyone that can give me some advce?
有没有人可以给我一些建议？
def sumofdoubles():
card=input()
x=len(card)
summ=0
for i in range(x-2,-1,-2):
j=int(card[i])
u=j+j
if u>9:
h=u/2
summ=summ+h
return(summ)
def sumofevens():
card=input()
x=len(card)
summ=0
for i in range(x-2,-1,-2):
j=int(card[i])
u=j+j
if u<9:
summ=summ+u
return(summ)
def sumofodds():
summ=0
card=input()
x=len(card)
for i in range(x-1,-1,-2):
j=int(card[i])
summ=summ+j
return(summ)
def main():
card=input()
length=len(card)
summ=0
while(card!="#####"):
if (card[0]=='4' or card[0]=='5' or card[0]=='6' or (card[0]=='3' and card[1]=='1')):
dbls=sumofdoubles()
evens=sumofevens()
odds=sumofodds()
if((dbls+evens+odds)%10==0):
print("Valid")
main()
This is the full traceback for those wondering
这是那些想知道的人的完整追溯
python test.py<s.input
File "test.py", line 52 in <module>
main()
File "test.py", line 48, in main
odds=sumofodds()
File "test.py", line 33, in sumofodds
j=int(card[i])
ValueError: invalid literal for int() with base 10: '#'
采纳答案by Lennart Regebro
Well, whatever you did you typed in something that isn't actually a Base 10 number. This includes anything that isn't number characters or spaces. So don't type in that. :-)
好吧，无论您输入了什么，实际上都不是 Base 10 数字。这包括任何不是数字字符或空格的内容。所以不要输入那个。:-)
Examples:
例子：
>>> int('04.9')
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ValueError: invalid literal for int() with base 10: '04.9'
>>> int('4-')
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ValueError: invalid literal for int() with base 10: '4-'
>>> int("Hyman")
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ValueError: invalid literal for int() with base 10: 'Hyman'
Update: Yes you typed a '#'. That's not a valid number.
更新：是的，您输入了“#”。那不是一个有效的数字。
回答by icktoofay
You're calling inputeach time you go into sumofodds, sumofevens, or sumofdoubles, so each of them will be working on a separate credit card number. You probably only want to be calling inputin mainand should be passing cardas an argument to each of those other functions.
您input每次进入sumofodds、sumofevens、 或时都会调用sumofdoubles，因此他们每个人都将使用一个单独的信用卡号。你可能只需要被调用input的main，应当通过card作为参数传递给每个这样的其他功能。
Your functions then might look something like this:
您的函数可能如下所示：
def sum_of_odds(card):
x = len(card)
# ...
# ...
def main():
while True:
card = input()
if card == '#####':
break
odds = sum_of_odds(card)
# ...
