'NoneType' object is not subscriptable
时间: 2023-09-28 10:12:16 浏览: 42
This error occurs when you try to access an element of an object that is None, i.e., it does not exist or has not been initialized.
For example, consider the following code:
```
x = None
print(x[0])
```
This will result in the 'NoneType' object is not subscriptable error because the variable x is None and therefore does not have any elements to access.
To avoid this error, you need to ensure that the object you are trying to access is not None before accessing its elements. You can do this by checking if the object is None using an if statement or using the None check operator 'is':
```
x = None
if x is not None:
print(x[0])
```
Alternatively, you can initialize the object with a default value to ensure that it is not None before accessing its elements:
```
x = []
print(x[0])
```