为什么我在这里得到了索引超出范围的错误，请解释。

huangapple
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英文:

why am i getting index out of range error here please explain

问题

  1. new_str = input()
  2. for j in range(len(new_str)):
  3.     for k in range(j+1, len(new_str)):
  4.         if new_str[j] == new_str[k]:
  5.             new_str = new_str[:k] + new_str[k+1:]
  6. print(new_str)

这里我尝试删除字符串中重复的字符并打印出来，但是出现了"string index out of range"错误。我不明白为什么会出现这个错误。有人可以解释一下吗？
错误信息如下：
Traceback (most recent call last):
File "/tmp/submission/20230712/16/14/hackerrank-253aaa8879419e0d201489ccb06df6d8/code/Solution.py", line 17, in
merge_the_tools(string, k)
File "/tmp/submission/20230712/16/14/hackerrank-253aaa8879419e0d201489ccb06df6d8/code/Solution.py", line 7, in merge_the_tools
if new_str[j] == new_str[k]:
~~~~~~~^^^
IndexError: string index out of range

  2. <details>
  3. <summary>英文:</summary>
  5.         new_str=input()
  6.         for j in range(len(new_str)):
  7.             for k in range(j+1,len(new_str)):
  8.                 if new_str[j]==new_str[k]:
  9.                     new_str=new_str[:k]+new_str[k+1:]
  10.         print(new_str)
  12. Here I am trying to remove the repeated letters of a string and print it but I am getting the error  of string index out of range. I am not understanding why. Can anyone explain me why?
  13. the error is
  14. Traceback (most recent call last):
  15.   File &quot;/tmp/submission/20230712/16/14/hackerrank-253aaa8879419e0d201489ccb06df6d8/code/Solution.py&quot;, line 17, in &lt;module&gt;
  16.     merge_the_tools(string, k)
  17.   File &quot;/tmp/submission/20230712/16/14/hackerrank-253aaa8879419e0d201489ccb06df6d8/code/Solution.py&quot;, line 7, in merge_the_tools
  18.     if new_str[j]==new_str[k]:
  19.                    ~~~~~~~^^^
  20. IndexError: string index out of range
  22. </details>
  25. # 答案1
  26. **得分**: 0
  28. 你在遍历循环时改变了字符串的长度，正如Taha的答案所述，这导致了`IndexError`。在这种情况下，最好使用`while`循环而不是`for`循环，它基于字符串的初始长度运行。
  30. 下面是更新后的代码。
  32. ```python
  33. new_str = input()
  35. left = 0
  36. while left < len(new_str) - 1:
  37.     right = left + 1
  39.     while right < len(new_str):
  40.         if new_str[left] == new_str[right]:
  41.             new_str = new_str[:right] + new_str[right + 1:]
  43.         right += 1
  45.     left += 1
  47. print(new_str)

在这里，left 和 right 分别代表你的迭代器 j 和 k。

输出（正面情况）：

  1. akka
  2. ak

输出（负面情况）：

  1. ghij
  2. ghij
英文:

You're changing the string length while iterating over the loop, as Taha's answer told, which is causing the IndexError. In this case, it's better to use a while loop rather than a for loop, which runs based on the initial length of the string.

Here's the updated code.

  1. new_str=input()
  3. left = 0
  4. while left &lt; len(new_str)-1:
  5. 	right = left + 1
  7. 	while right &lt; len(new_str):
  8. 		if new_str[left] == new_str[right]:
  9. 			new_str = new_str[:right] + new_str[right+1:]
  11. 		right += 1
  13. 	left += 1
  15. print(new_str)

left and right stand for your iterators j and k respectively here.

Output (Positive Case):

  1. akka
  2. ak

Output (Negative Case):

  1. ghij
  2. ghij

huangapple
  • 本文由 发表于 2023年7月13日 00:11:44
  • 转载请务必保留本文链接：https://go.coder-hub.com/76672562.html
  • python
  • string
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