else clauses in while and for loops
parkw at better.net
Mon Mar 27 23:51:49 CEST 2000
On Mon, Mar 27, 2000 at 08:50:44PM +0100, Ralph Corderoy wrote:
> > > Please give some examples showing the real need for else clauses in
> > > this context.
> > def lookup(stringList, word):
> > """Finds the first instance of word in stringList. Returns -1 if not
> > found"""
> > i = 0
> > while i < len(stringList):
> > if stringList[i] == word:
> > break
> > i = i + 1
> > else:
> > # is only executed if we never hit that break
> > return -1
> > return i
> I don't think that is a real need. Wouldn't it normally be written to
> return ASAP rather than jump through hoops.
> def lookup(stringList, word):
> i = 0
> while i < len(stringList):
> if stringList[i] == word:
> return i
> i = i + 1
> return -1
True. But, using "else" avoids having to deal with a local variable to
find out how it left the loop.
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