[CentralOH] Changing Exception Raised
Mark Erbaugh
mark at microenh.com
Wed Oct 20 22:47:13 CEST 2010
I didn't realize that other invalid inputs raised different exceptions. Thus, as you suggest, the naked except is probably safer.
Mark
On Oct 20, 2010, at 4:22 PM, Eric Floehr wrote:
> Mark,
>
> I think that way is pretty elegant. I don't know of a better way. Since you don't care, you could just do a naked "except:" which will catch everything and re-emit as a ValueError.
>
> I get bit by Decimal a lot because for purity it doesn't accept floats. In that case, a TypeError is raised.
>
> -Eric
>
>
> On Wed, Oct 20, 2010 at 3:55 PM, Mark Erbaugh <mark at microenh.com> wrote:
> I am developing some utility routines for parsing user input data. I would like all my routines to raise the same exception, i.e. ValueError, if the input data is invalid. In some cases, I can use routines already in the standard Python library. For example, decimal.Decimal() will take a string as input, so this is satisfactory to parse my input; however, decimal.Decimal() raises decimal.InvalidOperation if the string cannot be parsed. I could write code to catch the InvalidOperation exception and raise a ValueError, but I wonder if there is a better/more elegant way?
>
> Mark
>
> import decimal
>
> def str_to_decimal(x):
> """
> convert <str> do Decimal
>
> x - <str> input
> returns Decimal
> raises ValueError if x is not valid format for Decimal
> """
> try:
> return decimal.Decimal(x)
> except decimal.InvalidOperation:
> raise ValueError
>
>
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