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Re: Idiosyncratic python

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Date Fri, 25 Sep 2015 07:49:02 +1000
Subject Re: Idiosyncratic python
From Chris Angelico <rosuav@gmail.com>
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On Fri, Sep 25, 2015 at 7:08 AM, Laura Creighton <lac@openend.se> wrote:
> In a message of Thu, 24 Sep 2015 13:46:27 -0700, Ned Batchelder writes:
>>On Thursday, September 24, 2015 at 2:02:38 AM UTC-4, Steven D'Aprano wrote:
>>> What are your favorite not-wrong-just-weird Python moments?
>>
>>I've seen this a number of times:
>>
>>    dict_of_values.update({'key': some_value})
>>
>>why not:
>>
>>    dict_of_values['key'] = some_value
>>
>>I've considered writing a Pylint plugin to flag these...
>>
>>--Ned.
>
> A student today had a similar version of this one:
>
> Every time he wanted to change the value of dictionary mapping he would
> write:
> w={'key': new_value}
> dict_of_values.update(w)

That's a new one on me! The oddest dictionary code any of my students
has come out with (so far!) was a slavish habit of always iterating
over them thus:

for k,v in some_dict.items():

where some_dict is the only part that changed. So everywhere through
the code - even in nested loops - all dictionary iteration used "k"
and "v".

But I suspect it's exactly the same. Saw some code somewhere, found
that it worked, used it. If you don't understand something, don't
change it... which is a good policy in general, I suppose :)

ChrisA

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Thread

Idiosyncratic python Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-09-24 16:02 +1000
  Re: Idiosyncratic python Paul Rubin <no.email@nospam.invalid> - 2015-09-23 23:16 -0700
    Re: Idiosyncratic python Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-09-24 16:35 +1000
      Re: Idiosyncratic python Ben Finney <ben+python@benfinney.id.au> - 2015-09-24 16:54 +1000
        Re: Idiosyncratic python Steven D'Aprano <steve@pearwood.info> - 2015-09-25 11:08 +1000
      Re: Idiosyncratic python Terry Reedy <tjreedy@udel.edu> - 2015-09-24 02:54 -0400
  Re: Idiosyncratic python wxjmfauth@gmail.com - 2015-09-24 00:06 -0700
    Re: Idiosyncratic python Laurent Pointal <laurent.pointal@free.fr> - 2015-09-24 19:50 +0200
      Re: Idiosyncratic python Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-09-24 21:05 +0100
  Re: Idiosyncratic python jmp <jeanmichel@sequans.com> - 2015-09-24 11:12 +0200
  Re: Idiosyncratic python Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-09-24 14:09 +0100
  Re: Idiosyncratic python jmp <jeanmichel@sequans.com> - 2015-09-24 16:07 +0200
  Re: Idiosyncratic python Ian Kelly <ian.g.kelly@gmail.com> - 2015-09-24 08:26 -0600
  Re: Idiosyncratic python Chris Angelico <rosuav@gmail.com> - 2015-09-25 02:57 +1000
  Re: Idiosyncratic python jmp <jeanmichel@sequans.com> - 2015-09-24 20:04 +0200
  Re: Idiosyncratic python Ian Kelly <ian.g.kelly@gmail.com> - 2015-09-24 12:19 -0600
  Re: Idiosyncratic python Ned Batchelder <ned@nedbatchelder.com> - 2015-09-24 13:46 -0700
    Re: Idiosyncratic python Laura Creighton <lac@openend.se> - 2015-09-24 23:08 +0200
    Re: Idiosyncratic python Chris Angelico <rosuav@gmail.com> - 2015-09-25 07:49 +1000
    Re: Idiosyncratic python Steven D'Aprano <steve@pearwood.info> - 2015-09-25 10:55 +1000
  Re: Idiosyncratic python sohcahtoa82@gmail.com - 2015-09-24 15:32 -0700
  Re: Idiosyncratic python Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-09-25 00:40 +0100
  Re: Idiosyncratic python Akira Li <4kir4.1i@gmail.com> - 2015-09-25 03:04 +0300
  Re: Idiosyncratic python Steven D'Aprano <steve@pearwood.info> - 2015-09-25 10:08 +1000

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