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Python argparse: Make at least one argument required
...tiple aspects of command line based program:
good design of command line
selecting/using proper parser
argparse offers a lot, but restricts possible scenarios and can become very complex.
With docopt things go much shorter while preserving readability and offering high degree of flexibility. If...
phpcms v9获取当前页面地址的方法:{$url} - 更多技术 - 清泛网 - 专注C/C++及内核技术
phpcms v9获取当前页面地址的方法:{$url}phpcms_current_page_url1、获取当前页面地址的方法:{$url}，可以在模板中生成静态页时使用。不过在新建或编辑内容页时值为空，这时可以考虑使用go()函数。2、主页 {$url} 返回空字符串，因此需要...
- App Inventor 2 中文网 - 清泛IT社区，为创新赋能！
...)(API23+)判断是否已被电池优化豁免。
- 跳设置页引导:最稳的是Settings.ACTION_APPLICATION_DETAILS_SETTINGS(package:包名)→落到"应用详情页",再用文字引导用户开:省电策略=无限制、锁屏显示、自启动。
不能做(...
内存优化总结:ptmalloc、tcmalloc和jemalloc - 操作系统(内核) - 清泛网 - ...
... 总共32个vcpu。 16个table，每个5M row。
OLTP_RO测试包含5个select查询：select_ranges, select_order_ranges, select_distinct_ranges, select_sum_ranges,
可以看到在多核心或者多线程的场景下， jemalloc和tcmalloc带来的tps增加非常明显。
参考资料
glibc...
Discuz开启帖子快速回复，设置无效 - 更多技术 - 清泛网 - 专注C/C++及内核技术
... $allowfastpost = false;
}
$fastpost = $allowfastpost;
主题列表页设置开，帖子内容页里无论设置是开还是关，都是有快速回复的；
主题列表页设置关，帖子内容页里无论设置是开还是关，都是没快速回复的；
Discuz 快速回复
Background color of text in SVG
...or to SVG elements. You can do it programmatically with d3.
var text = d3.select("text");
var bbox = text.node().getBBox();
var padding = 2;
var rect = self.svg.insert("rect", "text")
.attr("x", bbox.x - padding)
.attr("y", bbox.y - padding)
.attr("width", bbox.width + (padding*2))
...
剖析程序的内存布局 - C/C++ - 清泛网 - 专注C/C++及内核技术
...位模式下它总是一个4GB的内存地址块。这些虚拟地址通过页表（page table）映射到物理内存，页表由操作系统维护并被处理器引用。每一个进程拥有一套属于它自己的页表，但是还有一个隐情。只要虚拟地址被使能，那么它就会...
Creating a “logical exclusive or” operator in Java
...
Java does have a logical XOR operator, it is ^ (as in a ^ b).
Apart from that, you can't define new operators in Java.
Edit: Here's an example:
public static void main(String[] args) {
boolean[] all = { false, true };
for (boolean a : all...
Remove duplicates in the list using linq
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var distinctItems = items.GroupBy(x => x.Id).Select(y => y.First());
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What are bitwise operators?
...ns
00000001
which is not 0, so the flag does specify READ.
You can use XOR to toggle various bits. I've used this when using a flag to specify directional inputs (Up, Down, Left, Right). For example, if a sprite is moving horizontally, and I want it to turn around:
Up: 00000001
Down: ...