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How do I create a SHA1 hash in ruby?
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There's also Digest::SHA1.base64digest 'foo'
– andrewrk
Jan 14 '12 at 1:31
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二维码的生成细节及原理 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...字符，数字，日文，中文等等。这两天学习了一下二维码图片生成的相关细节，觉得这个玩意就是一个密码算法，在此写一这篇文章 ，揭露一下。供好学的人一同学习之。
关于QR Code Specification，可参看这个PDF：http://raidenii.net/f...
What's the valid way to include an image with no src?
...ogramming.com/2009/03/15/the-tiniest-gif-ever
<img src="data:image/gif;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs=" width="0" height="0" alt="" />
Edit based on comment below:
Of course, you must consider your browser support requirements. No support for IE7 or less is notable. http://cani...
Objective-C implicit conversion loses integer precision 'NSUInteger' (aka 'unsigned long') to 'int'
... for help, clarification, or responding to other answers.Making statements based on opinion; back them up with references or personal experience.To learn more, see our tips on writing great answers.
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【App Inventor 2 数据可视化】使用柱状图和饼图收集数据 - App应用开发 - ...
...ot;#ffc107">sadButton</font>做同样的操作。用下面的图片检查你的工作。编码Reset按钮。
当按“Reset”键，会将所有变量重置为0。用下图检查你的代码。拖动barGraphData2D，重置柱状图。从barGraphData2D抽屉中清除:
使用相同的...
Java Byte Array to String to Byte Array
...he bytes as raw data (as binary) instead of a string, or perhaps even as a Base64 string, which would only require you to convert it back as a base 256 (binary) value.
– Yanick Rochon
Feb 4 '13 at 17:06
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Python Pandas: Get index of rows which column matches certain value
...] returns the ith row of df. i does not refer to the index label, i is a 0-based index.
In contrast, the attribute index returns actual index labels, not numeric row-indices:
df.index[df['BoolCol'] == True].tolist()
or equivalently,
df.index[df['BoolCol']].tolist()
You can see the difference ...
How to save/restore serializable object to/from file?
...an hold in memory, you might want to switch to an object store (object database) instead of a file.
– Tezra
Jun 15 '17 at 17:39
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Assign pandas dataframe column dtypes
... for help, clarification, or responding to other answers.Making statements based on opinion; back them up with references or personal experience.To learn more, see our tips on writing great answers.
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Is there a constraint that restricts my generic method to numeric types?
...on any Y should be able to be passed to that method as a substitute of its base type.
– Jeroen Vannevel
Mar 17 '14 at 21:58
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