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| From | Paul Rubin <no.email@nospam.invalid> |
| Newsgroups | comp.lang.python |
| Subject | Re: Appending to dictionary of lists |
| References | <4dc05c8b$0$41117$e4fe514c@news.xs4all.nl> |
| Date | Tue, 03 May 2011 12:56:44 -0700 |
| Message-ID | <7x7ha75zib.fsf@ruckus.brouhaha.com> (permalink) |
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| NNTP-Posting-Date | 03 May 2011 14:56:44 CDT |
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| Xref | x330-a1.tempe.blueboxinc.net comp.lang.python:4571 |
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"Alex van der Spek" <zdoor@xs4all.nl> writes:
> refd=dict.fromkeys(csvr.fieldnames,[]) ...
> I do not understand why this appends v to every key k each time.
You have initialized every element of refd to the same list. Try
refd = dict((k,[]) for k in csvr.fieldnames)
instead.
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Appending to dictionary of lists "Alex van der Spek" <zdoor@xs4all.nl> - 2011-05-03 21:50 +0200
Re: Appending to dictionary of lists Paul Rubin <no.email@nospam.invalid> - 2011-05-03 12:56 -0700
Re: Appending to dictionary of lists "Alex van der Spek" <zdoor@xs4all.nl> - 2011-05-03 22:20 +0200
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