CODEWITHSUNDEEP
pythonerror-handlingexception
Codebender
Codebender

Reputation: 14438

Can I create custom exceptions with another exception (similar to "causedby" in Java)

I am working on a framework and writing extensions to it.

The problem is that I only have to raise a particular class of Exception for the framework.

class FrameworkException(Exception):

I can raise an Exception which is the a subclass of FrameworkException and the framework will take care of logging/reporting the exception.

Now, in my plugin I can get a variety of exceptions, let's say a ValueError. Can I create a FrameworkException with all the details of ValueError somehow?

In Java, I will do something like this,

catch (IOException e) {
    throw new FrameworkException(e);
}

In this way, all the details of the original exception e will be preserved including the message and stacktrace like this,

Exception in thread "main" FrameworkException: IOException: Custom Message
    at com.Test.main(Test.java:115)
Caused by: IOException: Custom Message
    at com.Test.main(Test.java:113)

Is something similar possible in Python?

I tried,

except Exception as e:
    raise FrameworkException(e)

But it lost the original traceback and had only the message.

I am using Python 2.7 by the way.

Upvotes: 1

Views: 58

Answers (1)

svfat
svfat

Reputation: 3373

In Python 2 you can raise the your exception with the original traceback, so you shold write:

raise FrameworkException, FrameworkException(e), sys.exc_info()[2]

Or switch to a Python 3

Upvotes: 1

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