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How do I determine the target architecture of static library (.a) on Mac OS X?
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244
Another option is lipo; its output is brief and more readable than otool's.
An example:
% li...
How to import multiple .csv files at once?
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274
Something like the following should result in each data frame as a separate element in a singl...
Insert, on duplicate update in PostgreSQL?
...ing syntax (similar to MySQL)
INSERT INTO the_table (id, column_1, column_2)
VALUES (1, 'A', 'X'), (2, 'B', 'Y'), (3, 'C', 'Z')
ON CONFLICT (id) DO UPDATE
SET column_1 = excluded.column_1,
column_2 = excluded.column_2;
Searching postgresql's email group archives for "upsert" leads to...
How does Python manage int and long?
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126
int and long were "unified" a few versions back. Before that it was possible to overflow an int...
Why does Python print unicode characters when the default encoding is ASCII?
From the Python 2.6 shell:
6 Answers
6
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How to Sign an Already Compiled Apk
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293
create a key using
keytool -genkey -v -keystore my-release-key.keystore -alias alias_name -k...
Are GUID collisions possible?
I'm working on a database in SQL Server 2000 that uses a GUID for each user that uses the app it's tied to. Somehow, two users ended up with the same GUID. I know that microsoft uses an algorithm to generate a random GUID that has an extremely low chance of causing collisons, but is a collision stil...
How to change plot background color?
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242
Use the set_facecolor(color) method of the axes object, which you've created one of the follow...
What is the fastest or most elegant way to compute a set difference using Javascript arrays?
...if don't know if this is most effective, but perhaps the shortest
A = [1, 2, 3, 4];
B = [1, 3, 4, 7];
diff = A.filter(function(x) { return B.indexOf(x) < 0 })
console.log(diff);
Updated to ES6:
A = [1, 2, 3, 4];
B = [1, 3, 4, 7];
diff = A.filter(x => !B.includes(x) );
console.log(diff)...
How to draw border around a UILabel?
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265
You can set label's border via its underlying CALayer property:
#import <QuartzCore/Quartz...