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Apply multiple functions to multiple groupby columns
... group. When aggregating, g will be a Series. Passing g.index to df.ix[] selects the current group from df. I then test if column C is less than 0.5. The returned boolean series is passed to g[] which selects only those rows meeting the criteria.
In [95]: cust = lambda g: g[df.loc[g.index]['C']...
mysql query order by multiple items
...
SELECT some_cols
FROM prefix_users
WHERE (some conditions)
ORDER BY pic_set DESC, last_activity;
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关于php的socket初探 - PHP - 清泛IT论坛，有思想、有深度
...连接的模型都应该被称为多路复用，目前比较常用的有 select/poll/epoll/kqueue 这些 IO 模型（目前也有像 Apache 这种每个连接用单独的进程/线程来处理的 IO 模型，但是效率相对比较差，也很容易出问题，所以暂时不做介绍了）。在...
Detailed 500 error message, ASP + IIS 7.5
...rs to browser", and click "Apply".
Under "Error Pages" on the home screen select "500", then "Edit feature settings" and select "Detailed Errors".
Note that the same steps apply for IIS 8.0 (Windows Server 2012).
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Chaining multiple filter() in Django, is this a bug?
...estricted the set of blogs further to those that are also (B). The entries select by the second filter may or may not be the same as the entries in the first filter.`
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What is the Scala identifier “implicitly”?
...oot Implicit Views
An Implicit View can be triggered when the prefix of a selection (consider for example, the.prefix.selection(args) does not contain a member selection that is applicable to args (even after trying to convert args with Implicit Views). In this case, the compiler looks for implicit...
Why does “_” (underscore) match “-” (hyphen)?
...u want to use the underscore in like as a literal, you have to escape it:
select * from a where name like '%taz\_manual%.pdf%';
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What specific productivity gains do Vim/Emacs provide over GUI text editors?
...
Yeah, the mouse can be a timesaver for selecting areas of text, or moving the cursor to a specific spot in a large amount of text. Otherwise, it's a waste.
– T.E.D.
Jul 7 '09 at 14:27
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Interface Builder: What are the UIView's Layout iOS 6/7 Deltas for?
...ew to see how this will render in iOS 7 and iOS 6 device.
Quick steps:
Select each immediate children of root view individually and add 20px to its 'Y' value.
Then, select all immediate children collectively and give delta Y as -20px. You can also do this in batch or individually.
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Printing 1 to 1000 without loop or conditionals
...it };
printf("%d\n", j);
ft[j/1000](j + 1);
}
int main(int argc, char *argv[])
{
f(1);
}
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edited Apr 30 '11 at 11:53
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