大约有 5,500 项符合查询结果（耗时：0.0187秒） [XML]
Why dict.get(key) instead of dict[key]?
...des looking up all the valid keys only)
def getway(d):
for i in range(100):
s = d.get(i)
def lookup(d):
for i in range(100):
s = d[i]
Now timing these two functions using timeit
>>> import timeit
>>> print(timeit.timeit("getway({i:i for i in range(100)}...
Find size of object instance in bytes in c#
... start_mem = GC.GetTotalMemory(true);
aclass[] array = new aclass[1000000];
for (int n = 0; n < 1000000; n++)
array[n] = new aclass();
double used_mem_median = (GC.GetTotalMemory(false) - start_mem)/1000000D;
Do not use serialization.A binary formatter adds...
Positioning element at center of screen
...;
left: 50%;
margin-top: -50px;
margin-left: -50px;
width: 100px;
height: 100px;
}
Please don't use inline styles! Here is a working example http://jsfiddle.net/S5bKq/.
share
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How to change the default GCC compiler in Ubuntu?
...ll g++-4.5
update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-4.6 100
update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-4.5 50
update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.6 100
update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.5 50
update-alternatives...
What are the differences between a multidimensional array and an array of arrays in C#?
...0.349 25.861 26.214 19.677 20.171
5.050 5.085 6.412 5.225 5.100 5.751 6.650 5.222 6.770 5.305
The first row are timings of jagged arrays, the second shows multidimensional arrays and the third, well that's how it should be. The program is shown below, FYI this was tested r...
Select n random rows from SQL Server table
...
SET STATISTICS TIME ON
SET STATISTICS IO ON
/* newid()
rows returned: 10000
logical reads: 3359
CPU time: 3312 ms
elapsed time = 3359 ms
*/
SELECT TOP 1 PERCENT Number
FROM Numbers
ORDER BY newid()
/* TABLESAMPLE
rows returned: 9269 (varies)
logical reads: 32
CPU time: 0 ms
...
How can I scale an image in a CSS sprite
...ion:relative; overflow:hidden; max-width:160px;}
.stretchy .spacer {width: 100%; height: auto;}
.stretchy .sprite {position:absolute; top:0; left:0; max-width:none; max-height:100%;}
.stretchy .sprite.s2 {left:-100%;}
.stretchy .sprite.s3 {left:-200%;}
HTML
<a class="stretchy" href="#">
&...
Initializing a two dimensional std::vector
...:
std::vector<std::vector<int>>v(10,std::vector<int>(11,100));
10 is the size of the outer or global vector, which is the main one, and 11 is the size of inner vector of type int, and initial values are initialized to 100! That's my first help on stack, i think it helps someone....
How to format numbers? [duplicate]
... I first wrote this answer, but the current status looks good.
var n = 100000;
var value = n.toLocaleString(
undefined, // leave undefined to use the browser's locale,
// or use a string like 'en-US' to override it.
{ minimumFractionDigits: 2 }
);
console.log(value);
// In en-US...
How can I center a div within another div? [duplicate]
...y: fiddle
CSS
.container {
background: yellow;
width: %100;
display: flex;
flex-direction: row;
flex-wrap: wrap;
justify-content: center;
align-items: center;
}
.centered-div {
width: 80%;
height: 190px;
mar...