python - 如何修复 : W602 deprecated form of raising exception

Question

如果我使用 pylint(通过 sublimerlinter)，我会收到以下警告消息:

W602 已弃用的引发异常的形式

这是我在代码中使用异常的方式:

if CONDITION == True:
    raise ValueError, HELPING_EXPLANATION

Answer 1

像这样提出你的异常:

if CONDITION == True:
    raise ValueError(HELPING_EXPLANATION)

来自 PEP 8 -- Style Guide for Python Code - Programming Recommendations :

When raising an exception, use raise ValueError('message') instead of the older form raise ValueError, 'message'.

The paren-using form is preferred because when the exception arguments are long or include string formatting, you don't need to use line continuation characters thanks to the containing parentheses. The older form will be removed in Python 3.