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What is a “callable”?
...t call it and catch TypeError later. callable is removed in Python 3.0 and 3.1, use callable = lambda o: hasattr(o, '__call__') or isinstance(o, collections.Callable).
Example, a simplistic cache implementation:
class Cached:
def __init__(self, function):
self.function = function
...
libcurl的使用总结 - C/C++ - 清泛网 - 专注C/C++及内核技术
...zhu@vip.qq.com
# FileName: test_download.cpp
# Version: 1.0
# LastChange: 2010-03-09 14:20:44
# Description:
# History:
============================================*/
#include <iostream>
#include <string>
#include <vector>
#include <map>
#include “...
Formula to determine brightness of RGB color
...ewhere...
Step One:
Convert all sRGB 8 bit integer values to decimal 0.0-1.0
vR = sR / 255;
vG = sG / 255;
vB = sB / 255;
Step Two:
Convert a gamma encoded RGB to a linear value. sRGB (computer standard) for instance requires a power curve of approximately V^2.2, though the "accurate" tr...
What's the difference between equal?, eql?, ===, and ==?
... example, perform type conversion across ==, but not across eql?, so:
1 == 1.0 #=> true
1.eql? 1.0 #=> false
So you're free to override this for your own uses, or you can override == and use alias :eql? :== so the two methods behave the same way.
equal? — identity comparison
Unlike ...
Java 理论与实践: 线程池与工作队列 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...并发实用程序，这个包应该用于 Java 开发工具箱 1.5 发行版。
结束语
线程池是组织服务器应用程序的有用工具。它在概念上十分简单，但在实现和使用一个池时，却需要注意几个问题，例如死锁、资源不足和wait() 及 notify(...
Shell脚本编程30分钟入门 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...老牌的脚本编程语言了，Python这些年也成了一些linux发行版的预置解释器。
编译型语言，只要有解释器，也可以用作脚本编程，如C shell是内置的（/bin/csh），Java有第三方解释器Jshell，Ada有收费的解释器AdaScript。
如下是一个PHP S...
Spring MVC @PathVariable getting truncated
...
For Spring 3.1 users - if you're using the new RequestMappingHandlerMapping instead, the property to set is useSuffixPatternMatch (also to false). @Ted: the linked issue mentions that in 3.2 they hope to add a bit more control so it doe...
Getting a map() to return a list in Python 3.x
...
@hughdbrown The argument for using 3.1's map would be lazy evaluation when iterating on a complex function, large data sets, or streams.
– Andrew Keeton
Aug 20 '09 at 0:45
...
How to round the corners of a button
...layer.borderColor=[uicolor blackColor].CGColor;
YourBtn1.layer.borderWidth=1.0f;
Swift 4 Solution
YourBtn1.layer.cornerRadius = YourBtn1.Frame.size.width/2
YourBtn1.layer.borderColor = UIColor.black.cgColor
YourBtn1.layer.borderWidth = 1.0
...
Understanding ibeacon distancing
...lculateAccuracy(int txPower, double rssi) {
if (rssi == 0) {
return -1.0; // if we cannot determine accuracy, return -1.
}
double ratio = rssi*1.0/txPower;
if (ratio < 1.0) {
return Math.pow(ratio,10);
}
else {
double accuracy = (0.89976)*Math.pow(ratio,7.7095) + 0.111; ...