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What does the caret operator (^) in Python do?
...
It's a bitwise XOR (exclusive OR).
It results to true if one (and only one) of the operands (evaluates to) true.
To demonstrate:
>>> 0^0
0
>>> 1^1
0
>>> 1^0
1
>>> 0^1
1
To explain one of your own exa...
What is the purpose of XORing a register with itself? [duplicate]
xor eax, eax will always set eax to zero, right? So, why does MSVC++ sometimes put it in my executable's code? Is it more efficient that mov eax, 0 ?
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Split function equivalent in T-SQL?
...AR(2048) = 'Mike/John/Miko/Matt'; DECLARE CaracString NVARCHAR(1) = '/'; SELECT * FROM dbo.FnSplitString (VarString, CaracString)
– fernando yevenes
Feb 8 '19 at 15:57
ad...
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...
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))
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调研结论：App内创建桌面快捷方式直达log目录可行吗？3种方案对比 - App应...
...M表现混乱，不建议作为正式方案。
2. "指向App内日志页"的桌面快捷方式：成熟可行。用扩展在桌面生成快捷方式，点开后直达App内建的"日志查看Screen"。这是最稳、体验最好的落地方案。
3. 免扩展的替代路线：...
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...