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Reverse / invert a dictionary mapping
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For Python 2.7.x
inv_map = {v: k for k, v in my_map.iteritems()}
For Python 3+:
inv_map = {v: k for k, v in my_map.items()}
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How to sort in-place using the merge sort algorithm?
.... It's a very good trade-off. Yes, it's possible to associate the original index with the rest of the key so that you've never got two elements the same, giving a stable sort; that comes at a necessary cost of some extra space (linear in the number of elements) because you can't maintain the relativ...
Best way to create a simple python web service [closed]
...t you can use it with wsgi in different environments (cgi, fcgi, apache/mod_wsgi or with a plain simple python server for debugging).
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Are there other whitespace codes like   for half-spaces, em-spaces, en-spaces etc useful in HTML
... There are also ZERO WIDTH JOINER fileformat.info/info/unicode/char/200d/index.htm and ZERO WIDTH NON JOINER that I tend to use more often than the zero-width spaces.
– Reb.Cabin
May 15 '18 at 22:11
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Double Negation in C++
...ernel). For GCC, they're implemented as follows:
#define likely(cond) (__builtin_expect(!!(cond), 1))
#define unlikely(cond) (__builtin_expect(!!(cond), 0))
Why do they have to do this? GCC's __builtin_expect treats its parameters as long and not bool, so there needs to be some form of conver...
Why so red? IntelliJ seems to think every declaration/method cannot be found/resolved
I just installed and re-installed IntelliJ. Every Java file is coming up RED. I checked the JDK; it is at 1.6.##. The maven clean install build worked just fine.
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How to close current tab in a browser window?
...ndow.close();
or you can specify a different window.
So:
function close_window() {
if (confirm("Close Window?")) {
close();
}
}
with HTML:
<a href="javascript:close_window();">close</a>
or:
<a href="#" onclick="close_window();return false;">close</a>
You r...
Passport.js - Error: failed to serialize user into session
...d serializing user information but only id's (for bloat/perf reasons personally).
– electblake
Jan 22 '16 at 20:03
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Composite Key with EF 4.1 Code First
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Anyway to add unique constraints / indexes that are not really keys?
– Shimmy Weitzhandler
Nov 28 '12 at 0:41
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What is mattr_accessor in a Rails module?
I couldn't really find this in Rails documentation but it seems like 'mattr_accessor' is the Module corollary for 'attr_accessor' (getter & setter) in a normal Ruby class .
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