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Groups > comp.lang.python > #22189

Re: Documentation, assignment in expression.

From Thomas Rachel <nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915@spamschutz.glglgl.de>
Newsgroups comp.lang.python
Subject Re: Documentation, assignment in expression.
Date 2012-03-26 15:59 +0200
Organization A newly installed InterNetNews server
Message-ID <jkpsnh$t5k$1@r03.glglgl.gl> (permalink)
References <4f6d0060$0$6634$9b4e6d93@newsspool2.arcor-online.net> <mailman.948.1332551363.3037.python-list@python.org> <4f6f0d24$0$6561$9b4e6d93@newsspool4.arcor-online.net> <mailman.965.1332680571.3037.python-list@python.org>

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Am 25.03.2012 15:03 schrieb Tim Chase:
> Perhaps a DB example
> works better. With assignment allowed in an evaluation, you'd be able to
> write
>
> while data = conn.fetchmany():
>     for row in data:
>         process(row)
>
> whereas you have to write
>
> while True:
>     data = conn.fetchmany()
>     if not data: break
>     for row in data:
>         process(row)

Or simpler

for data in iter(conn.fetchmany, []):
     for row in data:
         process(row)

provided that a block of rows is returned as a list - which might be 
different among DB engines.


Thomas

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Thread

Documentation, assignment in expression. Alexander Blinne <news@blinne.net> - 2012-03-23 23:59 +0100
  Re: Documentation, assignment in expression. Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2012-03-23 21:09 -0400
    Re: Documentation, assignment in expression. Alexander Blinne <news@blinne.net> - 2012-03-25 14:18 +0200
      Re: Documentation, assignment in expression. Tim Chase <python.list@tim.thechases.com> - 2012-03-25 08:03 -0500
        Re: Documentation, assignment in expression. Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-03-26 05:36 +0000
          Re: Documentation, assignment in expression. Terry Reedy <tjreedy@udel.edu> - 2012-03-26 12:00 -0400
        Re: Documentation, assignment in expression. Thomas Rachel <nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915@spamschutz.glglgl.de> - 2012-03-26 15:59 +0200
          Re: Documentation, assignment in expression. Tim Chase <python.list@tim.thechases.com> - 2012-03-26 12:42 -0500
      Re: Documentation, assignment in expression. Chris Angelico <rosuav@gmail.com> - 2012-03-26 00:11 +1100
      Re: Documentation, assignment in expression. Tim Chase <python.list@tim.thechases.com> - 2012-03-25 08:48 -0500
        Re: Documentation, assignment in expression. Kiuhnm <kiuhnm03.4t.yahoo.it> - 2012-03-25 17:16 +0200
          Re: Documentation, assignment in expression. Tim Chase <python.list@tim.thechases.com> - 2012-03-25 13:22 -0500
          Re: Documentation, assignment in expression. Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-03-26 05:47 +0000
          Re: Documentation, assignment in expression. Devin Jeanpierre <jeanpierreda@gmail.com> - 2012-03-26 04:52 -0400
            Re: Documentation, assignment in expression. Kiuhnm <kiuhnm03.4t.yahoo.it> - 2012-03-26 12:56 +0200
              Re: Documentation, assignment in expression. Jussi Piitulainen <jpiitula@ling.helsinki.fi> - 2012-03-26 14:13 +0300
                Re: Documentation, assignment in expression. Kiuhnm <kiuhnm03.4t.yahoo.it> - 2012-03-26 13:58 +0200
        Re: Documentation, assignment in expression. rusi <rustompmody@gmail.com> - 2012-03-25 09:17 -0700
        Re: Documentation, assignment in expression. mwilson@the-wire.com - 2012-03-25 19:09 -0400
          Re: Documentation, assignment in expression. Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2012-03-25 22:29 -0400
            Re: Documentation, assignment in expression. mwilson@the-wire.com - 2012-03-26 07:27 -0400
      Re: Documentation, assignment in expression. Chris Angelico <rosuav@gmail.com> - 2012-03-26 01:11 +1100
        Re: Documentation, assignment in expression. Kiuhnm <kiuhnm03.4t.yahoo.it> - 2012-03-25 17:17 +0200
      Re: Documentation, assignment in expression. Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2012-03-25 18:59 -0400
        Re: Documentation, assignment in expression. Thomas Rachel <nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915@spamschutz.glglgl.de> - 2012-03-26 15:54 +0200
          Re: Documentation, assignment in expression. Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2012-03-26 12:16 -0400
      Re: Documentation, assignment in expression. Tim Chase <python.list@tim.thechases.com> - 2012-03-26 05:14 -0500
  Re: Documentation, assignment in expression. Roy Smith <roy@panix.com> - 2012-03-23 21:37 -0400

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