Writing a string.ishex function

[MRAB]

Arnaud Delobelle wrote:
> "D'Arcy J.M. Cain" <darcy at druid.net> writes:
> 
>> On Thu, 14 Jan 2010 09:07:47 -0800
>> Chris Rebert <clp2 at rebertia.com> wrote:
>>> Even more succinctly:
>>>
>>> def ishex(s):
>>>     return all(c in string.hexdigits for c in s)
>> I'll see your two-liner and raise you.  :-)
>>
>> ishex = lambda s: all(c in string.hexdigits for c in s)
> 
> I'see your one-liner and raise you by four characters :o)
> 
> ishex1 = lambda s: all(c in string.hexdigits for c in s) # Yours
> ishex2 = lambda s: not(set(s)-set(string.hexdigits))     # Mine
> 
I raise you one character:

ishex2 = lambda s: not(set(s)-set(string.hexdigits))     # Yours
ishex3 = lambda s: not set(s)-set(string.hexdigits)      # Mine

I could actually go three better:

ishex3=lambda s:not set(s)-set(string.hexdigits)

:-)

> Notice that ishex2 is more accurate than ishex1.  E.g.
> 
>>>> ishex1(['abc', '123'])
> True
>>>> ishex2(['abc', '123'])
> False
>