metaperl kirjoitti:
> For this program:
>
> def reverse(data):
> for index in range(len(data)-1, -1, -1):
> yield data[index]
>
> r = reverse("golf")
>
> for char in r:
> print char
>
>
> I'm wondering if the line:
>
> r = reverse("golf")
>
> "demands" the contents of the function reverse() all at once and if I
> must write
>
> for char in reverse("golf"):
> print char
>
> if I want the results streamed instead of generated complely.
>
> ** CONTEXT **
>
> The simple example above is not what I am really doing. My real
> program parses very large
> data files using pyparsing. Pyparsing can generate incremental/yielded
> results with no problem:
>
> http://pyparsing.wikispaces.com/message/view/home/248539#248852
>
> but because I believe in injection of control (pushing data around as
> opposed to having
> the target pull it), I get the parse and then inject it into the
> generator:
>
> parse = parsing.parse(fp.read())
> txt = textgen.generate(self.storage.output, patent_key,
> parse, f.basename(), debug=False)
>
I don't know, I'm guessing:
... r = reverse("golf")
... type(r)
<type 'generator'>
... print r.next()
f
So r is not the string 'flog', it is the generator producing it
HTH,
Jussi
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