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Does Python have an ordered set?
... have two methods both called union in the same class. The last one will "win" and the first one will fail to exist at runtime. This is because OrderedSet.union (no parens) has to refer to a single object.
– Kevin
Dec 5 '14 at 17:38
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List of ANSI color escape sequences
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2-bit Colours
You've got this already!
4-bit Colours
The standards implementing terminal colours began with limited (4-bit) options. The table below lists the RGB values of the background and foreground colours used for these by ...
How do I compile a Visual Studio project from the command-line?
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Using msbuild as pointed out by others worked for me but I needed to do a bit more than just that. First of all, msbuild needs to have access to the compiler. This can be done by running:
"C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\vcvarsall.bat"
Then msbuild was not in my $PATH so I...
CPU指令集avx程序无法运行，运行崩溃 - C/C++ - 清泛网 - 专注C/C++及内核技术
... lscpu 命令查看CPU指令集，看是否支持。比如_mm256_cmpeq_epi64 这个函数需要avx2指令集，但是CPU不支持，就导致程序崩溃起不来。原因就是CPU不支持相应的指令集导致的。
Linux上使用 lscpu 命令查看CPU指令集，看是否支持。
比如 _m...
Lua简明教程 - 脚本技术 - 清泛IT论坛，有思想、有深度
...是块注释
这是块注释
变量Lua的数字只有double型，64bits，你不必担心Lua处理浮点数会慢（除非大于100,000,000,000,000），或是会有精度问题。你可以以如下的方式表示数字，0x开头的16进制和C是很像的。num = 1024
num = 3.0
num = 3.1416...
CentOS 6.4下Squid代理服务器的安装与配置 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...环境
操作系统：CentOS release 6.4 (Final)
Squid版本：squid-3.1.10-20.el6_5.3.x86_64
SELINUX=disabled
HTTP Service: stoped
三、安装Squid服务
3.1 检查squid软件是否安装
# rpm -qa|grep squid
3.2 如果未安装，则使用yum 方式安装
# yum -y install squid
3.3 ...
How can I get query string values in JavaScript?
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If you wanted to shorten it a bit more, you could do away with the ternary conditional and replace it with a bit of short-circuitry on that last line - return match && decodeURIComponent(match[1].replace(/\+/g, ' '));.
– Andy...
Can't pickle when using multiprocessing Pool.map()
...ber function.
Stealing @EricH.'s code from his answer and annotating it a bit (I retyped it hence all the name changes and such, for some reason this seemed easier than cut-and-paste :-) ) for illustration of all the magic:
import multiprocessing
import os
def call_it(instance, name, args=(), kwa...
How are feature_importances in RandomForestClassifier determined?
...ity" metric for feature importances. I personally find the second metric a bit more interesting, where you randomly permute the values for each of your features one-by-one and see how much worse your out-of-bag performance is.
Since what you're after with feature importance is how much each featur...
Maximum and Minimum values for ints
...entable by an unsigned word will be sys.maxsize * 2 + 1, and the number of bits in a word will be math.log2(sys.maxsize * 2 + 2). See this answer for more information.
Python 2
In Python 2, the maximum value for plain int values is available as sys.maxint:
>>> sys.maxint
9223372036854775...