logoalt Hacker News

9rx • today at 12:15 AM • 1 reply • view on HN

But no context, so in the real world you need to write:

    try:
        f = open('foo.txt', 'w')
    except Exception as e:
        raise NecessaryContext("important information") from e
Else your callers are in for a nightmare of a time trying to figure out why an exception was thrown and what to do with it. Worse, you risk leaking implementation details that the caller comes to depend on which will also make your own life miserable in the future.

Replies

tayo42 • today at 12:31 AM

How is a stack trace with line numbers and a message for the exception it self not enough information for why an exception was thrown?

The exceptions from something like open are always pretty clear. Like, the files not found, and here is the exact line of code and the entire call stack. what else do you want to know to debug?

➕ show 2 replies