[Python-Dev] Python 3000 PEP: Postfix type declarations

[Gustavo Carneiro]

On 4/1/07, Gustavo Carneiro <gjcarneiro at gmail.com> wrote:
>
> On 4/1/07, Georg Brandl <g.brandl at gmx.net> wrote:
> [...]
>
> > Example
> > =======
> >
> > This is the standard ``os.path.normpath`` function, converted to type
> > declaration
> > syntax::
> >
> >      def normpathƛ(path✎)✎:
> >          """Normalize path, eliminating double slashes, etc."""
> >          if path✎ == '':
> >              return '.'
> >          initial_slashes✓ = path✎.startswithƛ('/')✓
> >          # POSIX allows one or two initial slashes, but treats three or
> > more
> >          # as single slash.
> >          if (initial_slashes✓ and
> >              path✎.startswithƛ('//')✓ and not
> > path✎.startswithƛ('///')✓)✓:
> >              initial_slashesℕ = 2
> >          comps♨ = path✎.splitƛ('/')♨
> >          new_comps♨ = []♨
> >          for comp✎ in comps♨:
> >              if comp✎ in ('', '.')⒯:
> >                  continue
> >              if (comp✎ != '..' or (not initial_slashesℕ and not
> > new_comps♨)✓ or
> >                   (new_comps♨ and new_comps♨[-1]✎ == '..')✓)✓:
> >                  new_comps♨.appendƛ(comp✎)
> >              elif new_comps♨:
> >                  new_comps♨.popƛ()✎
> >          comps♨ = new_comps♨
> >          path✎ = '/'.join(comps♨)✎
> >          if initial_slashesℕ:
> >              path✎ = '/'*initial_slashesℕ + path✎
> >          return path✎ or '.'
> >
> > As you can clearly see, the type declarations add expressiveness, while
> > at the
> > same time they make the code look much more professional.
>
>
>   Is this supposed to be a joke?


  /me ashamed for not having noticed the date of this PEP... :P

-- 
Gustavo J. A. M. Carneiro
"The universe is always one step beyond logic."
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