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How do I exchange keys with values in a dictionary?
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Python 2:
res = dict((v,k) for k,v in a.iteritems())
Python 3 (thanks to @erik):
res = dict((v,k) for k,v in a.items())
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How to replace text between quotes in vi
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edited Feb 21 '16 at 8:09
kabirbaidhya
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Filter dataframe rows if value in column is in a set list of values [duplicate]
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edited Feb 25 at 0:45
Harvey
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How do CUDA blocks/warps/threads map onto CUDA cores?
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2 Answers
2
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Rank function in MySQL
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270
One option is to use a ranking variable, such as the following:
SELECT first_name,
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Which is better, number(x) or parseFloat(x)?
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answered Dec 3 '12 at 2:13
Nathan WallNathan Wall
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How do you create nested dict in Python?
I have 2 CSV files: 'Data' and 'Mapping':
4 Answers
4
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How can I filter a Django query with a list of values?
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562
From the Django documentation:
Blog.objects.filter(pk__in=[1, 4, 7])
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sed error: “invalid reference \1 on `s' command's RHS”
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Don't you need to actually capture for that to work? i.e. for variant 2:
-r -e "s/WARNING: (\([a-zA-Z0-9./\\ :-]\+\))/${warn}WARNING: \1${c_end}/g" \
(Note: untested)
Without the -r argument back-references (like \1) won't work.
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