Writing a string.ishex function

Duncan Booth duncan.booth at invalid.invalid
Fri Jan 15 11:23:39 CET 2010

MRAB <python at mrabarnett.plus.com> wrote:

> Duncan Booth wrote:
>> MRAB <python at mrabarnett.plus.com> wrote:
>>> 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)
>> But none of those pass your own "ishex('') should return False" test.
> Neither do the others!

That's true, but since you were the one that pointed out they were all 
broken I would have thought your solution should actually work.

I'm sure you'll agree that a longer solution that works trumps any short 
but broken solution.

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