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How can I get the sha1 hash of a string in node.js?
...var shasum = crypto.createHash('sha1')
shasum.update('foo')
shasum.digest('hex') // => "0beec7b5ea3f0fdbc95d0dd47f3c5bc275da8a33"
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Understanding Python's “is” operator
...ider this:
>>> a = [1,2,3]
>>> b = [1,2,3]
>>> hex(id(a))
'0x1079b1440'
>>> hex(id(b))
'0x107960878'
>>> a is b
False
>>> a == b
True
>>>
The above example shows you that the identity (can also be the memory address in Cpython) is dif...
Named colors in matplotlib
...e are ten distinct colors:
HTML
You can also plot colors by their HTML hex code:
plt.plot([1,2], lw=4, c='#8f9805')
This is more similar to specifying and RGB tuple rather than a named color (apart from the fact that the hex code is passed as a string), and I will not include an image of the ...
使用App Inventor 2 控制物联网设备/低功耗蓝牙设备(BLE) · App Inventor 2 中文网
...，我们主要关注提供通过这种通信方法与 BLE 设备连接的模块。 当智能手机找到想要连接的设备时，它将启动连接。 智能手机现在通过管理定时以及从传感器发送或接收数据来承担中央或主角色，而传感器在此连接期间仅扮演...
Create a hexadecimal colour based on a string with JavaScript
... string (will usually be a single word) and from that somehow generate a hexadecimal value between #000000 and #FFFFFF , so I can use it as a colour for a HTML element.
...
PHP function to generate v4 UUID
...4 UUID in PHP. This is the closest I've been able to come. My knowledge in hex, decimal, binary, PHP's bitwise operators and the like is nearly non existant. This function generates a valid v4 UUID up until one area. A v4 UUID should be in the form of:
...
How to create default value for function argument in Clojure
...imal "10")
;10
You could also create a "local default" using let:
(let [hex (partial string->integer 16)]
(* (hex "FF") (hex "AA")))
;43350
The partial function approach has one key advantage over the others: the consumer of the function can still decide what the default value will be rath...
How do I use Node.js Crypto to create a HMAC-SHA1 hash?
... key = 'abcdeg'
crypto.createHmac('sha1', key)
.update(text)
.digest('hex')
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Linux下部署企业级邮件服务器(postfix + dovecot + extmail) - 开源 & Gith...
...erl Makefile.PL
make
make install
正常使用校验码
安装perl-GD模块可以解决
yum install gd-devel
wget http://search.cpan.org/CPAN/authors/id/L/LD/LDS/GD-2.53.tar.gz
tar -zxvf GD-2.53.tar.gz
cd GD-2.53
perl Makefile.PL
make
make install
安装连接mysql的驱动模块
y...
Nginx缓存解决方案：SRCache - 更多技术 - 清泛网 - 专注C/C++及内核技术
...RCache工作原理
当问题比较简单的时候，通常SRCache和Memc模块一起搭配使用。网上能搜索到一些相关的例子，大家可以参考，这里就不赘述了。当问题比较复杂的时候，比如说缓存键的动态计算等，就不得不写一点代码了，此时...