Python 尝试从字符串转换为int时，以10为基数的int（）的文本无效

我对编程相当陌生，我一直在用python做项目euler问题。遇到了上面的错误。我不完全确定这意味着什么，也不确定如何修复它。这是我的密码：

class question8(object):
"""This question gives a 1000 digit number and asks you to find the largest product of 13 consecutive digits"""
def __init__(self):
       self.inputSequence = "7316717653133062491922511967442657474235534919493496983520312774506326239578318016984801869478851843858615607891129494954595017379583319528532088055111254069874715852386305071569329096329522744304355766896648950445244523161731856403098711121722383113622298934233803081353362766142828064444866452387493035890729629049156044077239071381051585930796086670172427121883998797908792274921901699720888093776657273330010533678812202354218097512545405947522435258490771167055601360483958644670632441572215539753697817977846174064955149290862569321978468622482839722413756570560574902614079729686524145351004748216637048440319989000889524345065854122758866688116427171479924442928230863465674813919123162824586178664583591245665294765456828489128831426076900422421902267105562632111110937054421750694165896040807198403850962455444362981230987879927244284909188845801561660979191338754992005240636899125607176060588611646710940507754100225698315520005593572972571636269561882670428252483600823257530420752963450"

def productFinder(self):
       input = []
       num = '1'
       for i in range(0,1001):
           input.append(int(self.inputSequence[i:i+1]))


       largestProduct = 0
       largestPosition = 0
       product = 1;
       x=0
       y=0
       while x<len(input):
          y=x
          for i in range(0,14):
              product = product*input[x]
              x+=1
          if product>largestProduct:
              largestProduct=product
              x = y
              x+=1
          else: 
              x+=1
       return largestProduct

类问题8（对象）：
“”“此问题给出一个1000位数字，并要求您查找13个连续数字的最大乘积”“”
定义初始化（自）：
self.inputSequence="7316717653133062491922511967442657474235534919493496983520312774506326239578318016984801869478851843858615607891129494954595017379583319528532088055111254069874715852386305071569329096329522744304355766896648950445244523161731856403098711121722383113622298934233803081353362766142828064444866452387493035890729629049156044077239071381051585930796086670172427121883998797908792274921901699720888093776657273330010533678812202354218097512545405947522435258490771167055601360483958644670632441572215539753697817977846174064955149290862569321978468622482839722413756570560574902614079729686524145351004748216637048440319989000889524345065854122758866688116427171479924442928230863465674813919123162824586178664583591245665294765456828489128831426076900422421902267105562632111110937054421750694165896040807198403850962455444362981230987879927244284909188845801561660979191338754992005240636899125607176060588611646710940507754100225698315520005593572972571636269561882670428252483600823257530420752963450"
def productFinder（自我）：
输入=[]
num='1'
对于范围（01001）内的i：
input.append（int（self.inputSequence[i:i+1]））
最大产品=0
最大位置=0
产品=1；
x=0
y=0
而xlargestProduct：
最大产品=产品
x=y
x+=1
其他：
x+=1
退货量最大的产品

---

错误来自“input.append（int（self.inputSequence[i:i+1]）”行。提前感谢您的帮助！

您应该避免使用像

input

这样的内置变量名

通过将该行分解为多个组件，可以更好地调试该行

   for i in range(0,1001):
       s = self.inputSequence[i:i+1]
       print(repr(s))
       input.append(int(s))

甚至

   for i in range(0,1001):
       s = self.inputSequence[i:i+1]
       try:
           input.append(int(s))
       except ValueError:
           print("s = {!r}".format(s))
           raise

最好是完全避免在某个范围内循环

inp = [int(s) for s in self.inputSequence]

---

考虑以下代码：

def productFinder(self):
       input = []
       num = '1'
       for i in range(0,1001):
           input.append(int(self.inputSequence[i:i+1]))

当它到达字符串末尾时：

>>> "50"[0:1]
'5'
>>> "50"[1:2]
'0'
>>> "50"[2:3]
''
>>> int('')
Traceback (most recent call last):
  File "<interactive input>", line 1, in <module>
ValueError: invalid literal for int() with base 10: ''
>>> 

>“50”[0:1]
'5'
>>> "50"[1:2]
'0'
>>> "50"[2:3]
''
>>>整数（“”）
回溯（最近一次呼叫最后一次）：
文件“”，第1行，在
ValueError:基数为10的int（）的文本无效：“”
>>> 

1000位数字

0到999是一千步

0到1000是一千零一

0到1001是一千零二

---

我认为您正在将数字的结尾溢出到空白处。

是的，您是对的，最后的数组有一个空值，谢谢！此评论非常有用，您的解决方案也很有效，谢谢！现在我要去了解这些异常情况和repr（）。