Robert Kern wrote:
> I find that using the "key" argument to sort is much nicer than "cmp"
> for these tasks.
>
> In [5]:L = [datetime.date(2005,5,2), datetime.date(1984,12,15),
> datetime.date(1954,1,1)]
>
> In [7]:L.sort(key=lambda x: (x.month, x.day))
>
> In [8]:L
> Out[8]:
> [datetime.date(1954, 1, 1),
> datetime.date(2005, 5, 2),
> datetime.date(1984, 12, 15)]
Yes, definitely. Also worth noting in Robert Kern's solution is that
instead of writing:
def mycmp(d1, d2):
return cmp(d1.month,d2.month) or cmp(d1.day,d2.day)
you can write:
def mycmp(d1, d2):
return cmp((d1.month, d1.day), (d2.month, d2.day))
or if you're using the key= argument (like you probably should):
def mykey(d):
return (d.month, d.day)
The point here is that rather than chaining cmp() calls with ors, you
should just use a tuple -- the standard comparison order in tuples is
exactly what you're looking for.
STeVe
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