[Python-de] Re: for unpacking

From	Mike Müller <mmueller@python-academy.de>
Newsgroups	de.comp.lang.python
Subject	[Python-de] Re: for unpacking
Date	2024-08-09 08:03 +0200
Organization	Python Academy GmbH & Co. KG
Message-ID	<b40500c6-78d7-4131-a92b-e017797e89e1@python-academy.de> (permalink)
References	<lhfh20Faok1U1@mid.individual.net> <7294d25e-f0ff-4333-8f17-7e7d59c41933@python-academy.de> <lhguo8Fh1mgU2@mid.individual.net>

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Am 07.08.24 um 11:57 schrieb Patrick Rudin über python-de:
> Mike Müller wrote:
>> nummern = [[5,5,5]]
>> nummern.append([9,9,9])
>>
>> for a,b,c in nummern:
>>      print('vorher: ', id(b))
>>      b += c
>>      print('nachher:', id(b))
>>
>>
>> Ausgabe:
>>
>> vorher:  4375044856
>> nachher: 4375045016
>> vorher:  4375044984
>> nachher: 4375045272
> 
> Das hilft aber nicht weiter, weil:
> 
> zahlen = [[5,5,5]]
> zahlen.append([9,9,9])
> 
> for t in zahlen:
>      print('vorher: ', id(t[1]))
>      t[1] += t[2]
>      print('nachher:', id(t[1]))
> 
> vorher:  11743656
> nachher: 11743816
> vorher:  11743784
> nachher: 11744072
> 
> Kurzum: Auch da wird ein neues Objekt erzeugt.

Und das neue Objekt kommt dann mit:

t[1] += t[2]

in die Liste. Aufgelöst in zwei Zeilen ist da vielleicht verständlicher:

b += t[2]
t[1] = b

Der Name `b` ist natürlich frei wählbar und könnte zum Beispiel auch `tmp`
sein.

Also anstatt den Wert eines Objektes zu modifizieren kommt ein neues Element
an der Stelle Index `1` in die Liste.

Viele Grüße
Mike


> 
> 
> Gruss
> 
> Patrick
> _______________________________________________
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Thread

for unpacking Patrick Rudin <taxi_bs@gmx.ch> - 2024-08-06 22:57 +0200
  Re: for unpacking "Peter J. Holzer" <hjp-usenet4@hjp.at> - 2024-08-06 23:45 +0200
    Re: for unpacking "Peter J. Holzer" <hjp-usenet4@hjp.at> - 2024-08-07 13:24 +0200
  Re: for unpacking "Peter J. Holzer" <hjp-usenet4@hjp.at> - 2024-08-07 00:02 +0200
    Re: for unpacking Patrick Rudin <taxi_bs@gmx.ch> - 2024-08-07 11:54 +0200
      Re: for unpacking "Peter J. Holzer" <hjp-usenet4@hjp.at> - 2024-08-07 13:21 +0200
        Re: for unpacking Patrick Rudin <taxi_bs@gmx.ch> - 2024-08-07 22:58 +0200
    Re: for unpacking Patrick Rudin <taxi_bs@gmx.ch> - 2024-08-09 22:18 +0200
      Re: for unpacking Patrick Rudin <taxi_bs@gmx.ch> - 2024-08-10 12:07 +0200
        Re: for unpacking "Peter J. Holzer" <hjp-usenet4@hjp.at> - 2024-08-10 13:49 +0200
      Re: for unpacking "Peter J. Holzer" <hjp-usenet4@hjp.at> - 2024-08-10 12:46 +0200
        Re: for unpacking Patrick Rudin <taxi_bs@gmx.ch> - 2024-08-10 22:09 +0200
          Re: for unpacking "Peter J. Holzer" <hjp-usenet4@hjp.at> - 2024-08-11 12:26 +0200
            Re: for unpacking "Peter J. Holzer" <hjp-usenet4@hjp.at> - 2024-08-11 15:05 +0200
              Re: for unpacking "Peter J. Holzer" <hjp-usenet4@hjp.at> - 2024-08-11 17:44 +0200
            Re: for unpacking Patrick Rudin <taxi_bs@gmx.ch> - 2024-08-11 17:26 +0200
              Re: for unpacking "Peter J. Holzer" <hjp-usenet4@hjp.at> - 2024-08-11 18:16 +0200
                Re: for unpacking Patrick Rudin <taxi_bs@gmx.ch> - 2024-08-11 23:18 +0200
                Re: for unpacking "Peter J. Holzer" <hjp-usenet4@hjp.at> - 2024-08-11 23:43 +0200
                Re: for unpacking Patrick Rudin <taxi_bs@gmx.ch> - 2024-08-12 21:03 +0200
                Re: for unpacking Hermann Riemann <nospam.ng@hermann-riemann.de> - 2024-08-13 02:44 +0200
                Re: for unpacking Hermann Riemann <nospam.ng@hermann-riemann.de> - 2024-08-13 19:36 +0200
                Re: for unpacking "Peter J. Holzer" <hjp-usenet4@hjp.at> - 2024-08-13 19:47 +0200
                Re: for unpacking Hermann Riemann <nospam.ng@hermann-riemann.de> - 2024-08-14 04:38 +0200
                Re: for unpacking "Peter J. Holzer" <hjp-usenet4@hjp.at> - 2024-08-14 08:26 +0200
                Re: for unpacking Hermann Riemann <nospam.ng@hermann-riemann.de> - 2024-08-14 10:25 +0200
                Re: for unpacking "Peter J. Holzer" <hjp-usenet4@hjp.at> - 2024-08-14 13:22 +0200
                Re: for unpacking Hermann Riemann <nospam.ng@hermann-riemann.de> - 2024-08-14 14:45 +0200
                Re: for unpacking Patrick Rudin <taxi_bs@gmx.ch> - 2024-08-12 21:06 +0200
                Re: for unpacking "Peter J. Holzer" <hjp-usenet4@hjp.at> - 2024-08-13 00:24 +0200
                Re: for unpacking Hermann Riemann <nospam.ng@hermann-riemann.de> - 2024-08-14 14:41 +0200
                Re: for unpacking Hermann Riemann <nospam.ng@hermann-riemann.de> - 2024-08-14 18:39 +0200
                Re: for unpacking Ralph Aichinger <ralph@pi.h5.or.at> - 2024-08-14 17:05 +0000
                Re: for unpacking Hermann Riemann <nospam.ng@hermann-riemann.de> - 2024-08-15 05:44 +0200
                Re: for unpacking Patrick Rudin <taxi_bs@gmx.ch> - 2024-08-16 13:31 +0200
                Re: for unpacking Patrick Rudin <taxi_bs@gmx.ch> - 2024-08-13 23:06 +0200
                Re: for unpacking "Peter J. Holzer" <hjp-usenet4@hjp.at> - 2024-08-13 23:19 +0200
                Re: for unpacking Patrick Rudin <taxi_bs@gmx.ch> - 2024-08-14 21:11 +0200
                Re: for unpacking Patrick Rudin <taxi_bs@gmx.ch> - 2024-08-14 21:08 +0200
        Re: for unpacking Patrick Rudin <taxi_bs@gmx.ch> - 2025-10-06 22:46 +0200
          Re: for unpacking "Peter J. Holzer" <hjp-usenet4@hjp.at> - 2025-10-06 23:37 +0200
            Re: for unpacking Hermann Riemann <nospam.ng@hermann-riemann.de> - 2025-10-07 09:01 +0200
              Re: for unpacking Patrick Rudin <taxi_bs@gmx.ch> - 2025-10-07 14:22 +0200
                Re: for unpacking ram@zedat.fu-berlin.de (Stefan Ram) - 2025-10-07 13:13 +0000
                Re: for unpacking Hermann Riemann <nospam.ng@hermann-riemann.de> - 2025-10-07 15:34 +0200
                Re: for unpacking Patrick Rudin <taxi_bs@gmx.ch> - 2025-10-07 22:57 +0200
            Re: for unpacking Patrick Rudin <taxi_bs@gmx.ch> - 2025-10-10 21:50 +0200
  [Python-de] Re: for unpacking Mike Müller <mmueller@python-academy.de> - 2024-08-07 09:14 +0200
    Re: [Python-de] Re: for unpacking Patrick Rudin <taxi_bs@gmx.ch> - 2024-08-07 11:57 +0200
      Re: [Python-de] Re: for unpacking "Peter J. Holzer" <hjp-usenet4@hjp.at> - 2024-08-08 23:18 +0200
      [Python-de] Re: for unpacking Mike Müller <mmueller@python-academy.de> - 2024-08-09 08:03 +0200
  Re: for unpacking Hermann Riemann <nospam.ng@hermann-riemann.de> - 2024-08-07 12:35 +0200

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