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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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#import using angle brackets < > and quote marks “ ”
I'm wondering what decides whether you're allowed to use <Header.h> or "Header.h" when you're importing files in Objective-C. So far my observation has been that you use the quote marks "" for files in your project that you've got the implementation source to, and angle brackets <>...
How to convert a string to lower case in Bash?
... case "$1" in
[A-Z])
n=$(printf "%d" "'$1")
n=$((n+32))
printf \\$(printf "%o" "$n")
;;
*)
printf "%s" "$1"
;;
esac
}
word="I Love Bash"
for((i=0;i<${#word};i++))
do
ch="${word:$i:1}"
lc "$ch"
done
Note: YMMV on this on...
Python division
...1
or from __future__ import division, which the forces / to adopt Python 3.x's behavior that always returns a float.
>>> from __future__ import division
>>> (10 - 20) / (100 - 10)
-0.1111111111111111
sh...
Get most recent file in a directory on Linux
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edited Jun 18 '09 at 23:19
answered Jun 18 '09 at 23:17
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Finding local maxima/minima with Numpy in a 1D numpy array
... Sven MarnachSven Marnach
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What is the purpose of the var keyword and when should I use it (or omit it)?
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1370
If you're in the global scope then there's not much difference. Read Kangax's answer for expla...
When to use “new” and when not to, in C++? [duplicate]
When should I use the "new" operator in C++? I'm coming from C#/Java background and instantiating objects is confusing for me.
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Recompile Heroku slug without push or config change
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edited Aug 6 '15 at 13:43
Brad Koch
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ans...
How can I pad an int with leading zeros when using cout
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383
With the following,
#include <iomanip>
#include <iostream>
int main()
{
std:...