[Python-3000] Droping find/rfind?

[David Hopwood]

Walter Dörwald wrote:
[...]
> Using find(), the code looks like this:
> 
> def splitfind(s):
>     pos = 0
>     while True:
>         posstart = s.find("{", pos)
>         if posstart < 0:
>             break
>         posarg = s.find(" ", posstart)
>         if posarg < 0:
>             break
>         posend = s.find("}", posarg)
>         if posend < 0:
>             break
>         prefix = s[pos:posstart]
>         if prefix:
>             yield (None, prefix)
>         yield (s[posstart+1:posarg], s[posarg+1:posend])
>         pos = posend+1
>     rest = s[pos:]
>     if rest:
>         yield (None, rest)
> 
> Using index() looks worse to me. The code is buried under the exception
> handling:
> 
> def splitindex(s):
>     pos = 0
>     while True:
>         try:
>             posstart = s.index("{", pos)
>         except ValueError:
>             break
>         try:
>             posarg = s.index(" ", posstart)
>         except ValueError:
>             break
>         try:
>             posend = s.find("}", posarg)
>         except ValueError:
>             break

          try:
              posstart = s.index("{", pos)
              posarg = s.index(" ", posstart)
              posend = s.find("}", posarg)
          except ValueError:
              break

is shorter and clearer than the version using 'find'.

-- 
David Hopwood <david.nospam.hopwood at blueyonder.co.uk>