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Iterating over every two elements in a list
...ls import izip
def pairwise(iterable):
"s -> (s0, s1), (s2, s3), (s4, s5), ..."
a = iter(iterable)
return izip(a, a)
for x, y in pairwise(l):
print "%d + %d = %d" % (x, y, x + y)
Or, more generally:
from itertools import izip
def grouped(iterable, n):
"s -> (s0,s1,s2,....
How to format strings using printf() to get equal length in the output?
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answered Nov 27 '09 at 15:42
Carl SmotriczCarl Smotricz
60.9k1717 gold badges115115 silver badges160160 bronze badges
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How to update npm
...-g meanio@latest . Prior to failing it notes that it 'wants' npm version 1.4.x, whereas I have 1.2.18 installed. So I tried updating npm to the latest; several ways. Last of which was...
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Is there a link to GitHub for downloading a file in the latest release of a repository?
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44
A few years late, but I just implemented a simple redirect to support https://github.com/USER/P...
What are the underlying data structures used for Redis?
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edited Sep 4 '13 at 19:39
myusuf3
15.8k2323 gold badges6767 silver badges9999 bronze badges
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JavaScript “new Array(n)” and “Array.prototype.map” weirdness
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14 Answers
14
Active
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Which is faster: multiple single INSERTs or one multiple-row INSERT?
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answered Nov 24 '09 at 21:57
mbarkhaumbarkhau
7,19333 gold badges2727 silver badges3434 bronze badges
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Random record in ActiveRecord
...e current record count) as an offset.
offset = rand(Model.count)
# Rails 4
rand_record = Model.offset(offset).first
# Rails 3
rand_record = Model.first(:offset => offset)
To be honest, I've just been using ORDER BY RAND() or RANDOM() (depending on the database). It's not a performance issue ...
Default template arguments for function templates
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edited Oct 10 '14 at 21:32
answered Mar 15 '10 at 13:47
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