On Oct 29, 3:57 pm, GHZ <[EMAIL PROTECTED]> wrote:
> Is this the best way to test every item in a list?
>
> def alltrue(f,l):
> return reduce(bool.__and__,map(f,l))
>
> def onetrue(f,l):
> return reduce(bool.__or__,map(f,l))
>
>
>
> >>> alltrue(lambda x:x>1,[1,2,3])
> False
>
> >>> alltrue(lambda x:x>=1,[1,2,3])
> True
In Py2.5, you can use the builtin any() and all() functions.
In Py2.4, use the recipes from the itertools module:
def all(seq, pred=None):
"Returns True if pred(x) is true for every element in the
iterable"
for elem in ifilterfalse(pred, seq):
return False
return True
def any(seq, pred=None):
"Returns True if pred(x) is true for at least one element in the
iterable"
for elem in ifilter(pred, seq):
return True
return False
def no(seq, pred=None):
"Returns True if pred(x) is false for every element in the
iterable"
for elem in ifilter(pred, seq):
return False
return True
Raymond
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