如何在Python中仅捕获某种类型的ValueError？

Question

我处理数据，对于某些示例，数据有问题。 Python引发了一个

ValueError：残差在初始点不是有限的。

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

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

但是它仍然一直在引发错误。 有没有办法实现我的想象？

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e.args[0]恰好包含此字符串（引发错误并显示e.args[0] ）

另请参见有关BaseException.args文档

Answer 2

您可以像这样捕获ValueError异常：

try:

    #[code that could raise the error]

except ValueError as e:

    print("Residuals are not finite in the initial point. ...")
    #[do stuff I want when the Residuals are not finite]