列表索引超出范围

Question

how is this possible, I have a list called "temp". This is what I have in my python interpreter.

In [150]: len(temp)
Out[150]: 773942

In [151]: temp[773942]

and I get an IndexError: list index out of range.

I'm confused because it just told me that there are 773942 values in the list, and now it tells me that the index is out of range?

Answer 1

The indices of a list are in the range from 0 to len(temp) - 1 . Your index is one past the end.

For example a list of length three has the following indices:

["a",   "b",   "c"]
 ^      ^      ^
 0      1      2

Accessing index 3 would be one past the end.

Answer 2

索引是从零开始的，所以最后一个元素是len（）-1

Answer 3

In python len() returns how many elements there are in your list. However indexes start at 0. So for example:

>>>a = [1,2,3]
>>>len(a)
3
>>>a[0]
1
>>>a[2]
3

So this maximum index of python list is len(list) - 1 otherwise error is raised.