Newbie naive question ... int() throws ValueError

[Ethan Furman]

Devin Jeanpierre wrote:
> On Fri, May 11, 2012 at 11:21 PM, Chris Angelico <rosuav at gmail.com> wrote:
>> There are times when you want to catch all exceptions, though.
>> Top-level code will often want to replace exception tracebacks with
>> error messages appropriate to some external caller, or possibly log
>> the exception and return to some primary loop. Otherwise, though, most
>> code will just let unexpected exceptions through.
> 
> I'm not talking about unexpected exceptions. I'm saying, if I expect
> invalid input for int, where should I go to find out how to deal with
> said invalid input properly? How do I know that int raises ValueError
> on failure, and not, for example, something like ArgumentError
> (something that Python doesn't have) or (like chr) TypeError?
> 
> Apparently the answer is to read the documentation for ValueError.
> 
> It's a bit like putting the documentation on the return type for `map`
> in the list documentation. Kinda hard to get there without already
> knowing the answer.

Unit tests.  :)

~Ethan~