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R - Concatenate two dataframes?
...ine adds column b to data frame b.
Results
> a <- data.frame(a=c(0,1,2), b=c(3,4,5), c=c(6,7,8))
> a
a b c
1 0 3 6
2 1 4 7
3 2 5 8
> b <- data.frame(a=c(9,10,11), c=c(12,13,14))
> b
a c
1 9 12
2 10 13
3 11 14
> b$b <- NA
> b
a c b
1 9 12 NA
2 10 13 NA
3 11 1...
Using python's eval() vs. ast.literal_eval()?
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datamap = eval(raw_input('Provide some data here: ')) means that you actually evaluate the cod...
Is there a JavaScript function that can pad a string to get to a determined length?
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Turn Pandas Multi-Index into column
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The reset_index() is a pandas DataFrame method that will transfer index values into the DataFr...
MLKitDocScanner 拓展：文档扫描（自动找边缘、纠正透视、导出 PDF） · Ap...
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模式用词不用数字。base / filter / full，而不是记不住的 1 / 2 / 3。
不重复造轮子。没有自带”分享”方法 —— App Inventor 本来就有「分享」组件，用它的 分享文件 块即可。
重要限制：文档扫描界面由 Google Play 服务提供，...
HTTP POST Returns Error: 417 “Expectation Failed.”
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System.Net.HttpWebRequest adds the header 'HTTP header "Expect: 100-Continue"' to every request unless you explicitly ask it not to by setting this static property to false:
System.Net.ServicePointManager.Expect100Continue = false;
Some servers choke on that header and send back the 41...
Easy interview question got harder: given numbers 1..100, find the missing number(s) given exactly k
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Django - what is the difference between render(), render_to_response() and direct_to_template()?
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https://docs.djangoproject.com/en/1.8/topics/http/shortcuts/#render
render(request, template[...
python assert with and without parenthesis
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The last assert would have given you a warning (SyntaxWarning: assertion is always true, perha...