python - 尝试访问第 N 个项目时出现 "IndexError: list index out of range"是否意味着我的列表中的项目少于 N 个？

Question

我告诉我的程序打印输出的第 53 行。这个错误是否告诉我没有那么多行，因此无法打印出来？

Answer 1

如果您有一个包含 53 个项目的列表，则最后一个是 thelist[52]，因为索引从 0 开始。

---

来自 Real Python: Understanding the Python Traceback - IndexError :

IndexError

The IndexError is raised when you attempt to retrieve an index from a sequence, like a list or a tuple, and the index isn’t found in the sequence. The Python documentation defines when this exception is raised:

Raised when a sequence subscript is out of range. (Source)

这是一个引发 IndexError 的示例:

test = list(range(53))
test[53]

---------------------------------------------------------------------------
IndexError                                Traceback (most recent call last)
<ipython-input-6-7879607f7f36> in <module>
      1 test = list(range(53))
----> 2 test[53]

IndexError: list index out of range

The error message line for an IndexError doesn’t give you great information. You can see that you have a sequence reference that is out of range and what the type of the sequence is, a list in this case. That information, combined with the rest of the traceback, is usually enough to help you quickly identify how to fix the issue.