Question

我对编程很新，我一直在python中执行项目euler问题。 I've been trying to do question 8并遇到上述错误。我不完全确定这意味着什么，我也不确定如何解决它。这是我的代码：

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

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

Answer 1

您应该避免使用像input这样的内置函数作为变量名

您可以通过将其分解为组件来更好地调试此行

   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

最好是避免在一个范围内循环

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

Answer 2

考虑一下你的代码：

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

当它到达你的字符串的末尾时：

>>> "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: ''
>>>

1000位数字

0到999是一千步

0到1000是一千零一个

0到1001是一千零两个

我认为你将数字的末尾超越了空白区域。

尝试从string转换为int时，int（）的基数为10的文字无效

2 个答案: