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Doing something before program exit
...int a message when my application was terminating:
import atexit
def exit_handler():
print 'My application is ending!'
atexit.register(exit_handler)
Just be aware that this works great for normal termination of the script, but it won't get called in all cases (e.g. fatal internal errors).
...
Bad class file magic or version
...
my JAVA_HOME variable changed to Java 1.8 and I got this error message when compiling a pure java module as a dependency of my android project.
build.gradle of the java module
apply plugin: 'java'
Solution #1: Quick an dirty
I ...
Tree data structure in C#
...eate a method with the signature of delegate ie for a tree of ints: void my_visitor_impl(int datum) - make it static if you need, instantiate a delgate: TreeVisitor<int> my_visitor = my_visitor_impl; and then invoke on the root node or NTree class if u make it static: NTree<int>.traverse...
Getting a map() to return a list in Python 3.x
...o be ASCII/latin-1 is to do bulk conversions at the C layer: bytes(sequence_of_ints_in_range_0_to_256).decode('latin-1') which makes a str faster by avoiding Python function calls for each element in favor of a bulk conversion of all elements using only C level function calls. You can wrap the above...
Javascript how to split newline
...t(`Current method: ${example.replace(/\r/g, "").split("\n")}`);
output("________");
});
function output(txt) {
console.log(txt.replace(/\n/g, "\\n").replace(/\r/g, "\\r"));
}
share
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Storing SHA1 hash values in MySQL
...INARY(20) and CHAR(40).
CREATE TABLE `binary` (
`id` int unsigned auto_increment primary key,
`password` binary(20) not null
);
CREATE TABLE `char` (
`id` int unsigned auto_increment primary key,
`password` char(40) not null
);
With million of records binary(20) takes 44.56M, whil...
How do I do an OR filter in a Django query?
...
@alexis: you could also do Item.objects.filter(creator__in=creators), for example.
– Kevin London
Dec 9 '14 at 23:11
4
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How to count the number of set bits in a 32-bit integer?
... may need to adjust it to work for a particular language (e.g. using uint32_t for C++ and >>> in Java):
int numberOfSetBits(uint32_t i)
{
// Java: use int, and use >>> instead of >>
// C or C++: use uint32_t
i = i - ((i >> 1) & 0x55555555);
i = (...
When to use dynamic vs. static libraries
...t virtual address. DLL certainly supports this.
– dma_k
Oct 2 '10 at 12:35
21
@dma_k: Windows DLL...
Days between two dates? [duplicate]
...est for calendar checks.
from datetime import timedelta, datetime
def cal_days_diff(a,b):
A = a.replace(hour = 0, minute = 0, second = 0, microsecond = 0)
B = b.replace(hour = 0, minute = 0, second = 0, microsecond = 0)
return (A - B).days
if __name__ == '__main__':
x = datetime...