我收到“ TypeError：异常必须从BaseException派生”即使我定义了它 [英] I get "TypeError: exceptions must derive from BaseException" even though I did define it

问题描述

根据python文档，异常是从BaseExceptions派生的，我应该将其用于用户定义的异常。所以我有：

according to python documents, Exception is derived from BaseExceptions and I should use it for user defined exceptions. so I have:

class VisaIOError(Exception):

    def __init__(self, error_code):
        abbreviation, description = _completion_and_error_messages[error_code]
        Error.__init__(self, abbreviation + ": " + description)
        self.error_code = error_code

和

 raise(visa_exceptions.VisaIOError, status)

但是我得到了（引用段）：

but I get (trackback snippet):

   File "C:\Python32\Lib\site-packages\pyvisa\vpp43.py", line 400, in check_status

    raise(visa_exceptions.VisaIOError, status)
    TypeError: exceptions must derive from BaseException

派生我正在将代码从python 27转换为32

Note: I am converting code from python 27 to 32

推荐答案

我要做：

raise visa_exceptions.VisaIOError(status)

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