如何更改Python中所有异常的错误消息？

class CustomException(Exception):
    pass

class CustomException(Exception):
    def __str__(self):
        return "自定义错误消息"

raise CustomException

def change_error_message(func):
    def wrapper(*args, **kwargs):
        try:
            return func(*args, **kwargs)
        except Exception as e:
            raise CustomException from e
    return wrapper

@change_error_message
def my_function():
    # 函数代码