On Mon, 27 Mar 2006 07:50:01 -0800, Arne Ludwig wrote:
> Just for completeness: The functions in Steve's original post named
> maximum calculate the minimum.
Er, yes. I benchmarked them but clearly I should have function-tested
them as well.
Here is, I hope, my last word on maximum(). It figures out whether it got
an iterator or a list, and does the right thing. I believe it will
compile and run correctly whether your version of Python has iterators or
not. And, it doesn't compute the minimum.
def maximum(cmp, seq):
"""
Return maximum value of seq, as chosen by provided cmp() function.
If seq contains multiple maximal values, return the last one.
Arguments:
cmp -- function reference; function should return values with the
same semantics as Python's cmp() function.
seq -- any sequence (a list or an iterator). If seq is empty, this
function will raise ValueError.
"""
# is it a list?
if hasattr(seq, "__getitem__"):
if len(seq) == 0:
raise ValueError, "seq must contain at least 1 element"
maxval = seq[0]
for v in seq:
if cmp(maxval, v) <= 0:
maxval = v
return maxval
# is it an iterator?
if hasattr(seq, "__iter__") and hasattr(seq, "next"):
try:
maxval = seq.next()
except StopIteration:
raise ValueError, "seq must contain at least 1 element"
for v in seq:
if cmp(maxval, v) <= 0:
maxval = v
return maxval
raise TypeError, "seq must be a list or an iterator"
--
Steve R. Hastings "Vita est"
[EMAIL PROTECTED] http://www.blarg.net/~steveha
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