如何在Python中只捕获某种类型的ValueError？

Question

我处理数据，对于某些示例，数据是有问题的。Python 提出了一个

ValueError：残差在初始点不是有限的。

是否有可能仅通过消息捕获值错误"Residuals are not finite in the initial point."？我试过：

try:
    [code that could raise the error]
except Exception as e:
    if e=='ValueError(\'Residuals are not finite in the initial point.\')':
        [do stuff I want when the Residuals are not finite]
    else:
        raise e

但它仍然一直引发错误。有没有办法实现我想象的样子？

谢谢

Answer 1

try:
    [code that could raise the error]
except ValueError as e:
    if len(e.args) > 0 and e.args[0] == 'Residuals are not finite in the initial point.':
        [do stuff I want when the Residuals are not finite]
    else:
        raise e

您可能必须检查是否e.args[0]完全包含该字符串（引发错误并打印e.args[0]）

另请参阅有关的文档BaseException.args