Status of PEP's?
cfelling at iae.nl
Thu Feb 28 17:29:35 CET 2002
Emile van Sebille <emile at fenx.com> wrote:
> "Remco Gerlich"
>> for i in 6: print i
>> for i in 6,7: print i
>> for i in 6,7,8: print i
>> You wouldn't think the first line does something different, would you?
> Is that really any different from what we have now:
> for i in "Spam": print i
Yes, it clearly is! `"Spam"' is a sequence, and iterating over a sequence
> for i in "Spam","and": print i
And here `"Spam", "and"' is a sequence of sequences, and again iterating
over a sequenc--even if it's a sequence of sequences--is understandable.
But iterating over an integer is even after that number theory lessons
we had last night still very hard for me to appreciate.
> I find the best argument for adding an iter method to ints is that it
> allows me to say:
> for ii in iter(len(mylist)):
And how would this compare to
for ii in indici(mylist):
This would read `for all ii in the indici for mylist', extremely clear
to me. We could even consider enhancing range to accept a list in
case of a single argument.
> However, the clarity and intent conveyed by allowing this, particularly
> for newbies, more than offsets the gotcha's, which, once learned, is the
> same set of gotcha's in place for strings.
And here you lost me. How can turning a single number into a sequence of
all its preceding numbers be easy to understand for someone not versed
in modern number theory or without a crack for weird syntactic sugar.
More information about the Python-list