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Date: Mon, 16 Mar 2015 13:39:18 +0100
From: Jonas Wielicki <jonas@wielicki.name>
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To: python-list@python.org
Subject: Re: generator/coroutine terminology
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On 16.03.2015 13:02, Steven D'Aprano wrote:
> (To be honest, I'm not even sure what the use-case for close() on corou=
tines
> is in the first place. If you don't want to send any more items into it=
,
> just don't send any more items into it.)

Just like with file-likes, it is useful to clean up resources. If you
use a coroutine with the lxml.etree.xmlfile interface [1] for instance
(code quoted from the reference):

    def writer(out_stream):
        with xmlfile(out_stream) as xf:
             with xf.element('{http://etherx.jabber.org/streams}stream'):=

                  try:
                      while True:
                          el =3D (yield)
                          xf.write(el)
                          xf.flush()
                  except GeneratorExit:
                      pass

This allows controlled (i.e. not governed by garbage collection) and
clean shutdown of a coroutine (albeit I=E2=80=99m not sure why they catch=
 the
GeneratorExit here), which will close the opened <stream> tag.

regards,
jwi

   [1]: http://lxml.de/api.html#incremental-xml-generation





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