How to test if object is an integer?

Mathias Lafeldt mathias.lafeldt at googlemail.com
Mon Oct 17 16:02:03 EDT 2011


On Sat, Oct 15, 2011 at 1:44 AM, MrPink <tdsimpson at gmail.com> wrote:
>
> Is there a function in Python that can be used to test if the value in
> a string is an integer?  I had to make one up for myself and it looks
> like this:
>
> def isInt(s):
>    try:
>        i = int(s)
>        return True
>    except ValueError:
>        return False

According to [1], there're more Exceptions to test for:

try:
    int(s)
    return True
except (TypeError, ValueError, OverflowError): # int conversion failed
    return False

[1] http://jaynes.colorado.edu/PythonIdioms.html, idiom "Catch errors
rather than avoiding them to avoid cluttering your code with special
cases"

-Mathias



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