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BLE（一）概述&工作流程&常见问题 - 创客硬件开发 - 清泛IT社区，...
...，即Bluetooth，是斯堪的纳维亚语中 Blåtand / Blåtann 的英化版本。该词是十世纪的一位国王Harald Bluetooth的绰号，相传他将纷争不断的丹麦部落统一为一个王国，并引入了基督教。蓝牙技术开发者Jim Kardach于1997年提出用Bluetooth这个...
理解Python的 with 语句 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...据发生异常，没有进行任何处理。下面是处理异常的加强版本：
file = open("/tmp/foo.txt")
try:
data = file.read()
finally:
file.close()
While this works well, it is unnecessarily verbose. This is where with is useful. The good thing about with apart from the be...
How to replace multiple strings in a file using PowerShell
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A third option, for a pipelined one-liner is to nest the -replaces:
PS> ("ABC" -replace "B","C") -replace "C","D"
ADD
And:
PS> ("ABC" -replace "C","D") -replace "B","C"
ACD
This preserves execution order, is easy to read, and fits neatly into a pipeline. I prefer to use parenthese...
linux: kill background task
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@polm23; no, ^Z doesn't background jobs, it stops them. A subsequent bg does the actual 'backgrounding' (resumes execution in the background), and after that $! works as expected.
– falstro
Oct 16 '12 at 14:39
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How to use Java property files?
...If you use the *.properties extension you can get editor support, e.g. Eclipse has a properties file editor.
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Graphviz: How to go from .dot to a graph?
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type: dot -Tps filename.dot -o outfile.ps
If you want to use the dot renderer. There are alternatives like neato and twopi. If graphiz isn't in your path, figure out where it is installed and run it from there.
You can change the outpu...
初窥InnoDB的Memcached插件 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...整性，我们选择从源代码安装MySQL，需要注意的是早期的版本有内存泄漏，所以推荐安装最新的稳定版，激活WITH_INNODB_MEMCACHED即可：
shell> groupadd mysql
shell> useradd -r -g mysql mysql
shell> tar zxvf mysql-<VERSION>.tar.gz
shell> cd mysql-5.6.13
sh...
How do I save a String to a text file using Java?
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In java8 you can try(PrintStream ps = new PrintStream("filename")) { ps.println(out); } this will handle close for you
– Anton Chikin
Feb 6 '15 at 16:14
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Grunt watch error - Waiting…Fatal error: watch ENOSPC
...ready loaded, that pony is fainting with exhaustion.
An alternative (perhaps comparable to taking excess garbage off of pony and placing in the dump), is to run:
npm dedupe
Then go congratulate yourself for making pony happy.
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Chaining multiple filter() in Django, is this a bug?
... potentially different row that matches B.
Look at the example here:
https://docs.djangoproject.com/en/dev/topics/db/queries/#spanning-multi-valued-relationships
particularly:
Everything inside a single filter() call is applied simultaneously to filter out items matching all those requiremen...