[Python-ideas] Revised**12 PEP on Yield-From

[Jacob Holm]

Scott David Daniels wrote:
> Now that we passed the magic three or four threshold, is
> it not easier to read if we pick some better names?
> 
>       _iter = iter(EXPR)
>       _call, _arg = next, _iter

                             ^^^^^ should be (_iter,)

>       while 1:
>           try:
>               _out = _call(_arg)

                              ^^^^ should be *_arg

>           except StopIteration as _except:
>               _result = _except.value
>               break
>           try:
>               _in = yield _out
>           except GeneratorExit as _except:
>               try:
>                   _close = _iter.close
>               except AttributeError:
>                   pass
>               else:
>                   _close()
>               raise _except
>           except BaseException as _except:
>               _a = sys.exc_info()

                 ^^ should be _arg, forcing the other changes.

>               try:
>                   _call = _iter.throw
>               except AttributeError:
>                   raise _except
>           else:
>               if _in is None:
>                   _call, _arg = next, _iter

                                         ^^^^^ should be (_iter,)

>               else:
>                   _call, _arg = _iter.send, _in

                                               ^^^ should be (_in,)

>       RESULT = _result


As noted inline, you missed one of the _a's and so falsely assumed there 
would always only be one argument to _call.  In the case of throw there 
is 3.

I don't really care what the variables are called.  That bikeshed 
discussion is not one I want to participate in.  Your names are as good 
as any I guess.

Anyway, this is moot unless Greg agrees that this style of expansion is 
a good idea in the first place.

Not-bikeshedding-ly yours
- Jacob