KeyError: 'train'
时间: 2024-01-21 21:01:56 浏览: 25
This error occurs when attempting to access a key that does not exist in a dictionary. In this case, the key 'train' was not found in the dictionary.
For example, if we have a dictionary called 'data' that contains information about different animals:
data = {'dog': 'friendly', 'cat': 'independent', 'hamster': 'cute'}
If we try to access the key 'train' in this dictionary, we will get a KeyError:
data['train']
Output:
KeyError: 'train'
To fix this error, we need to make sure that the key we are trying to access actually exists in the dictionary. In this case, we can add the key 'train' to the dictionary with a corresponding value, or we can check if 'train' is a valid key before accessing it.