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Select top 10 records for each category
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answered Oct 7 '08 at 2:13
Darrel MillerDarrel Miller
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How do you create nested dict in Python?
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313
A nested dict is a dictionary within a dictionary. A very simple thing.
>>> d = {}
&...
Getting the array length of a 2D array in Java
...tring[] args) {
int[][] foo = new int[][] {
new int[] { 1, 2, 3 },
new int[] { 1, 2, 3, 4},
};
System.out.println(foo.length); //2
System.out.println(foo[0].length); //3
System.out.println(foo[1].length); //4
}
Column lengths differ per row. If you're backing...
typedef fixed length array
I have to define a 24-bit data type.I am using char[3] to represent the type. Can I typedef char[3] to type24 ? I tried it in a code sample. I put typedef char[3] type24; in my header file. The compiler did not complain about it. But when I defined a function void foo(type24 val) {} in my C...
Rails 3 execute custom sql query without a model
...t that is supposed to deal with database. I used code given below in rails 3
5 Answers
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Pandas - How to flatten a hierarchical index in columns
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edited Jan 17 '14 at 19:36
answered Jan 24 '13 at 18:37
A...
二维码的生成细节及原理 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...n。Version 1是21 x 21的矩阵，Version 2是 25 x 25的矩阵，Version 3是29的尺寸，每增加一个version，就会增加4的尺寸，公式是：(V-1)*4 + 21（V是版本号） 最高Version 40，(40-1)*4+21 = 177，所以最高是177 x 177 的正方形。
下面我们看看一个二维...
How to get the value from the GET parameters?
...ers to JS):
var url_string = "http://www.example.com/t.html?a=1&b=3&c=m2-m3-m4-m5"; //window.location.href
var url = new URL(url_string);
var c = url.searchParams.get("c");
console.log(c);
For older browsers (including Internet Explorer), you can use this polyfill or the cod...
Using module 'subprocess' with timeout
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In Python 3.3+:
from subprocess import STDOUT, check_output
output = check_output(cmd, stderr=STDOUT, timeout=seconds)
output is a byte string that contains command's merged stdout, stderr data.
check_output raises CalledProcessE...
How to change line-ending settings
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edited May 26 '18 at 23:50
The Guy with The Hat
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