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Wed Sep 21 22:43:58 CEST 2011 · https://mail.python.org/pipermail/python-dev/2011-September/113625.html

On 21/09/2011 21.08, Michael Foord wrote:
> On 21/09/2011 18:02, Stephen J. Turnbull wrote:
>> Georg Brandl writes:
>>
>> >  I don't think so. "skip if not" reads pretty well for me, while I
>> >  always have to think twice about "unless" -- may be a non-native-
>> >  speaker thing.
>>
>> FWIW, speaking as one native speaker, I'm not sure about that.  "do ...
>> if not condition" doesn't bother me, whether I think of the condition
>> as an exception or as the normal state of affairs.  I find "do ...
>> unless condition" to be quite awkward if the condition is a normal 
>> state.
>
> I'm not a big fan of skipUnless, but there you go. I find "skip if 
> not" readable too and always have to "work out" what skipUnless means. 
> It's probably just that "if" and "if not" are such Python idioms and 
> "unless" isn't.

I don't find it too readable in other contexts (e.g. failUnless), but I 
probably got used to skipUnless with the idiom:
try:
     import foo
except ImportError:
     foo = None

@skipUnless(foo, 'requires foo')
...

FWIW in Lib/test/support.py we have a "skip_unless_symlink", but the 
other two skipUnless have more readable names: "requires_zlib" and 
"requires_IEEE_754".  In Lib/test/ "skipUnless" is used about 250 times, 
"skipIf" about 100.

Best Regards,
Ezio Melotti

>
> Michael
>
>

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[Python-Dev] cpython: Issue #1172711: Add 'long long' support to the array module.