[Python-3000] exclusion feature for 2to3?

[Alexandre Vassalotti]

On 7/15/07, Georg Brandl <g.brandl at gmx.net> wrote:
> Most obvious would be a special comment, something like
>
> for x in curiousobject.iteritems():  # 2to3:keep
>      foo(x)
>
> Does that make sense?

It would be a good idea to define a convention for these special
comments. For example, we could define something similar to C's
pragma:

  #pragma <feature> <option> ...
  or perhaps,
  #: <feature> <option> ...

So, your example would become:

  for x in curiousobject.iteritems(): #pragma 2to3 keep
     foo(x)

I expect other tools, like pdb.py and trace.py could follow this
convention as well. For example:

  def buggy_func(): #pragma pdb break
     pass

  if debug: #pragma trace ignore
     pass

The motivation for making a such convention, is to make it easy for
programmers to identify comments that are in fact control lines.

-- Alexandre