list indices must be integers or slices,not str
时间: 2024-08-13 08:02:21 浏览: 114
这个错误信息在Python编程中表示当你试图访问列表元素时,索引不是整数而是字符串。列表的索引通常需要是数值类型的,比如0、1、2等,或者是切片范围,如`[start:end]`。如果你提供的是一个字符串,例如`list[index_name]`,Python会抛出这个错误,因为它不清楚如何按名称而非数字去查找元素。正确的做法应该是用整数作为索引来获取对应的元素。例如:
```python
my_list = ['a', 'b', 'c']
# 错误:
# my_list['first'] # 抛出 "list indices must be integers or slices, not str" 错误
# 正确:
print(my_list) # 输出 'a'
```
相关问题
list indices must be integers or slices, not str
This error occurs when you try to use a string as an index for a list or sequence. In Python, list indices must be integers or slices, which means that they cannot be strings.
For example, if you have a list called `my_list` and you try to access an element using a string as an index like this:
```
my_list['hello']
```
You will get the "list indices must be integers or slices, not str" error.
To fix this error, you need to use an integer or a slice as the index. For example:
```
my_list[0] # access the first element of the list
my_list[1:3] # access a slice of the list from the second to the third element
```
If you need to convert a string to an integer to use it as an index, you can use the `int()` function:
```
index = int('2')
my_list[index] # access the third element of the list
```
list indices must be integers or slices.not str
这个错误通常出现在使用Python中的列表(list)时,当你尝试使用字符串(str)来访问一个列表元素时,就会出现这个错误。因为列表的索引必须是整数或切片对象,而字符串不是整数或切片对象。例如,如果你有一个列表a,你想访问它的第一个元素,正确的方式是使用a而不是a['0']。
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