Guido van Rossum schrieb:
On Tue, May 13, 2008 at 11:59 AM, Facundo Batista
<[EMAIL PROTECTED]> wrote:
2008/5/13, Steven D'Aprano <[EMAIL PROTECTED]>:
> Perhaps what we need is a more flexible enumerate function?
> enumerate(iterable, start_at_index=0, count_from=0)
+1 to provide both options: they're not intrusive (as I can keep using
enumerate without those), and having both helps in the understanding
of the function.
I mean, if I find an option that is "start", I can confuse if it will
start counting or giving me the elements of the iterable... if I found
both parameters, it will be easier to understand.
Actually, having both dramatically increases the potential for
confusion. Once you have the starting index option, you're always
going to be worried about whether the first index generated defaults
to zero or to the starting index, since depending on your use case one
or the other is vastly more useful...
We already have itertools.islice() which can handle both of these
easily (slice the input or slice the output).
-1 on providing a start index.
+1 on providing a start value for the count, making it a
positional-with-optional-keyword-name ('start') parameter.
This is what's now implemented in SVN. Thanks for the discussion!
cheers,
Georg
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