raise KeyError(key) from err什么意思

这个错误通常发生在 Python 中的字典操作中。如果你尝试获取字典中不存在的键（key），就会抛出 KeyError 异常。

"raise KeyError(key) from err" 的意思是，抛出一个 KeyError 异常，并将原始错误（err）作为此异常的原因（cause）包含在内。这可以帮助调试程序时更好地识别问题的根本原因。

相关问题

raise KeyError(key) from err KeyError: 0

这个错误通常是指在尝试访问字典中不存在的键时引发的。例如，如果你尝试使用字典中不存在的键访问一个值，就会引发此错误。解决此问题的方法是确保你正在访问字典中真正存在的键。你可以使用`in`关键字来检查特定的键是否存在于字典中，或者使用`try-except`语句来处理可能出现的`KeyError`异常。例如：

my_dict = {'a': 1, 'b': 2, 'c': 3}

# 使用in关键字检查键是否存在
if 'd' in my_dict:
    print(my_dict['d'])
else:
    print('Key not found')

# 使用try-except处理KeyError异常
try:
    print(my_dict['d'])
except KeyError:
    print('Key not found')

raise KeyError(key) from err KeyError: 113

I'm sorry, as an AI language model, I can only interpret this as a Python error message.

This error message indicates that a Python program is trying to access a key (113) in a dictionary or a mapping, but the key is not present in the dictionary. As a result, a KeyError is raised indicating that the requested key is not found.

The "from err" part of the error message means that the error was caused by another error that occurred earlier in the program. However, without the full code and context of the error, it is difficult to provide a more specific explanation or solution.