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Append integer to beginning of list in Python [duplicate]
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Is there a performance gain in using single quotes vs double quotes in ruby?
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$ ruby -v
ruby 1.9.3p0 (2011-10-30 revision 33570) [x86_64-darwin11.0.0]
$ cat benchmark_quotes.rb
# As of Ruby 1.9 Benchmark must be required
require 'benchmark'
n = 1000000
Benchmark.bm(15) do |x|
x.report("assign single") { n.times do; c =...
Math.random() versus Random.nextInt(int)
...tributed bits in its mantissa, so it is uniformly distributed in the range 0 to 1-(2^-53).
Random.nextInt(n) uses Random.next() less than twice on average- it uses it once, and if the value obtained is above the highest multiple of n below MAX_INT it tries again, otherwise is returns the value ...
PHP cURL vs file_get_contents
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answered Jun 16 '12 at 16:00
XeoncrossXeoncross
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What does .SD stand for in data.table in R
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206
.SD stands for something like "Subset of Data.table". There's no significance to the initial "....
How do I convert seconds to hours, minutes and seconds?
...gt;> import datetime
>>> str(datetime.timedelta(seconds=666))
'0:11:06'
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Rotating a two-dimensional array in Python
...nclose the whole thing in list() to get an actual list back out, so as of 2020 it's actually:
list(zip(*original[::-1]))
Here's the breakdown:
[::-1] - makes a shallow copy of the original list in reverse order. Could also use reversed() which would produce a reverse iterator over the list rather...
How can I print literal curly-brace characters in python string and also use .format on it?
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You need to double the {{ and }}:
>>> x = " {{ Hello }} {0} "
>>> print(x.format(42))
' { Hello } 42 '
Here's the relevant part of the Python documentation for format string syntax:
Format strings contain “replacement fields” surrounded by curly braces {}. Anythi...
Creating range in JavaScript - strange syntax
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+1000
Understanding this "hack" requires understanding several things:
Why we don't just do Array(5).map(...)
How Function.prototype.app...
Performance difference for control structures 'for' and 'foreach' in C#
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130
Well, it partly depends on the exact type of list. It will also depend on the exact CLR you're u...