On Sat, 25 Apr 2009 10:50:50 +0300, Ciprian Dorin, Craciun wrote:
> On Sat, Apr 25, 2009 at 10:43 AM, <bearophileh...@lycos.com> wrote:
>> Ciprian Dorin, Craciun:
>>> Python way:
>>> ---------
>>> def eq (a, b) :
>>> return a == b
>>>
>>> def compare (a, b, comp = eq) :
>>> if len (a) != len (b) :
>>> return False
>>> for i in xrange (len (a)) :
>>> if not comp (a[i], b[i]) :
>>> return False
>>> return True
>>
>> That's not "pythonic".
>>
>> Bye,
>> bearophile
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>
> Ok... Then what's pythonic? Please give a pythonic implementation...
Don't re-invent the wheel. Instead of creating your own functions, use
existing tools to your advantage.
import operator
def compare(a, b, comp=operator.eq):
if len(a) != len(b):
return False
for a, b in zip(a, b):
if not comp(a[i], b[i]):
return False
return True
But we can re-write that to be even more pythonic, by using the built-in
all():
def compare(a, b, comp=operator.eq):
if len(a) != len(b):
return False
return all(comp(x, y) for (x, y) in zip(a, b))
or even:
def compare(a, b, comp=operator.eq):
return (len(a) == len(b)) and all(comp(*t) for t in zip(a, b))
(All the above are untested, so please excuse any errors.)
> Ciprian Craciun.
>
> P.S.: Also, I'm tired of hearing about the pythonic way... Where
> do I find a definitive description about the pythonic way?
There is no such thing as a definitive description of pythonic -- it is
like art, and pornography: you can recognise it when you see it (except
when you can't).
However, you can get close by doing:
import this
in the Python interactive interpreter. Or from a shell prompt:
python -m this
> I think that
> this word is used only when someone sees something that he doesn't like,
> he doesn't know what he doesn't like at it, and just goes to say its
> un-pythonic, without saying what would be... Wouldn't be just easier to
> say "I don't know" or "I doesn't feel right to me"?
I think that there's a risk that people over-use unpythonic when they
mean "I don't like it", but that doesn't mean that pythonic isn't a
meaningful concept. However, it is a matter of degree, not kind: like
mole-hills and mountains, unpythonic and pythonic are very different
things, but there's no precise dividing line between them.
--
Steven
--
http://mail.python.org/mailman/listinfo/python-list
