using split for a string : error

Joel Goldstick joel.goldstick at gmail.com
Fri Jan 25 15:44:03 CET 2013


Don't forget to look at csv reader.

http://docs.python.org/2/library/csv.html


On Fri, Jan 25, 2013 at 9:31 AM, Hans Mulder <hansmu at xs4all.nl> wrote:

> On 25/01/13 15:04:02, Neil Cerutti wrote:
> > On 2013-01-25, Oscar Benjamin <oscar.j.benjamin at gmail.com> wrote:
> >> On 24 January 2013 11:35, Chris Angelico <rosuav at gmail.com> wrote:
> >>> It's usually fine to have int() complain about any
> >>> non-numerics in the string, but I must confess, I do sometimes
> >>> yearn for atoi() semantics: atoi("123asd") == 123, and
> >>> atoi("qqq") == 0. I've not seen a convenient Python function
> >>> for doing that. Usually it involves manually getting the
> >>> digits off the front. All I want is to suppress the error on
> >>> finding a non-digit. Oh well.
> >>
> >> I'm interested to know what the situations are where you want
> >> the behaviour of atoi().
> >
> > Right. atoi is no good even in C. You get much better control
> > using the sprintf family.
>
> I think you meant sscanf.
>
> It's true that sscanf gives you more control.  That being said,
> sometimes the one option atoi gives you, just happens to be what
> you need.
>
> > int would need to return a tuple of the
> > number it found plus the number of characters consumed to be more
> > useful for parsing.
> >
> >>>> intparse("123abc")
> > (123, 3)
> >
> > But that would make it might inconvenient for general use.
>
> If the new function is nameed intparse, and the existing int
> function remains available, then most use cases would be served
> by int, and intparse would be available as a building block for
> other use cases.  For example atoi could be defined as:
>
> def atoi(s): return intparse(s)[0]
>
> intparse("xyz") should return (0, 0), and leave it to the caller
> to decide whether a ValueError shoud be raised.
>
>
> -- HansM
>
>
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
Joel Goldstick
http://joelgoldstick.com
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