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How to determine a Python variable's type?
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yes, just using import email no classes of my own invention.
– Jasen
Aug 1 '18 at 23:38
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Unique constraint that allows empty values in MySQL
...he codes are unique, but some products simply doesn't have a code. I can't invent codes because those are providers codes.
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Django fix Admin plural
... a model somewhere in your own code you'll use this property instead of re-inventing the wheel.
– cibyr
Mar 10 '14 at 3:33
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Propagate all arguments in a bash shell script
...ere is historical progression here; $* did not work as designed, so $@ was invented to replace it; but the quoting rules being what they are, the double quotes around it are still required (or it will revert to the broken $* semantics).
– tripleee
Dec 15 '15 at...
How can I have a newline in a string in sh?
...ho's problems were the reason why the Unix Standardization process finally invented the printf utility, doing away with all the problems.
So to get a newline in a string:
FOO="hello
world"
BAR=$(printf "hello\nworld\n") # Alternative; note: final newline is deleted
printf '<%s>\n' "$FOO"
pri...
How to pass the value of a variable to the stdin of a command?
...s continues until you type a line containing 'quit'. You can be endlessly inventive with how you handle it. Beware the old urban legend of a program that stopped working when the users began working with Ecuador. They'd type in the name of the capital, Quito, and the program exited.
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BLE(二)信道&数据包&协议栈格式 - 创客硬件开发 - 清泛IT社区,...
文章源自:https://www.gandalf.site/2018/11/ble_23.html
参考低功耗蓝牙(BLE)安全初探
0x1 信道BLE的物理通道即“频道,分别是‘f=2402+k*2 MHz, k=0, … ,39’,带宽为2MHz”的40个RF Channel。
其中,有3个信道是advertising channel(广播通道)...
技术和资本玩转创客圈 英特尔在中国的动作才刚刚开始 - 资讯 - 清泛网 - 专...
...用到了两处,一是与本地的政府、大学、科研机构、创客社区等合作建设了12家联合众创空间;二是线上创新中心,由“创客大爆炸”在线众创空间为主导(英特尔作为联合创建方),整合硬享公社(英特尔的线上创客社区)、线上开...
Explode PHP string by new line
...ould ever use your snippet. The most direct / sensible technique for your invented string would be var_export(preg_split('~\R+~', $a, 0, PREG_SPLIT_NO_EMPTY)); Anything else is simply not clever. Demo
– mickmackusa
Sep 16 at 15:02
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Enum “Inheritance”
...ns above using classes with int constants lack type-safety. I.e. you could invent new values actually not defined in the class.
Furthermore it is not possible for example to write a method taking one of these classes as input.
You would need to write
public void DoSomethingMeaningFull(int consumeV...