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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