Re: I used defaultdic to store some variables but the output is blank

From	Peter Otten <__peter__@web.de>
Subject	Re: I used defaultdic to store some variables but the output is blank
Date	2013-06-09 14:46 +0200
Organization	None
References	<35dd1554-de27-4209-b62e-6a2968c19d0c@googlegroups.com> <7b40883a-4211-48cc-8db4-2414fa52e23a@googlegroups.com>
Newsgroups	comp.lang.python
Message-ID	<mailman.2917.1370782008.3114.python-list@python.org> (permalink)

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claire morandin wrote:

> Thanks Peter, true I did not realize that ercc_contigs is empty, but I am
> not sure how to "populate" the dictionary if I only have one column for
> the value but no key

You could use a "dummy value"

ercc_contigs = {}
for line in open('Faq_ERCC_contigs_name.txt'):
    gene = line.split()[0]
    ercc_contigs[gene] = None

but a better approach is to use a set instead of a dict:

ercc_contigs = set()
for line in open('Faq_ERCC_contigs_name.txt'):
    gene = line.split()[0]
    ercc_contigs.add(gene)

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I used defaultdic to store some variables but the output is blank claire morandin <claire.morandin@gmail.com> - 2013-06-09 03:12 -0700
  Re: I used defaultdic to store some variables but the output is blank Peter Otten <__peter__@web.de> - 2013-06-09 13:56 +0200
  Re: I used defaultdic to store some variables but the output is blank claire morandin <claire.morandin@gmail.com> - 2013-06-09 05:27 -0700
    Re: I used defaultdic to store some variables but the output is blank Peter Otten <__peter__@web.de> - 2013-06-09 14:46 +0200

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