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Pandas every nth row
...simpler solution to the accepted answer that involves directly invoking df.__getitem__.
df = pd.DataFrame('x', index=range(5), columns=list('abc'))
df
a b c
0 x x x
1 x x x
2 x x x
3 x x x
4 x x x
For example, to get every 2 rows, you can do
df[::2]
a b c
0 x x x
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PostgreSQL query to list all table names?
Is there any query available to list all tables in my Postgres DB.
7 Answers
7
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How to get the name of a function in Go?
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@themihai I don't know, the sentence I quoted is all the docs at golang.org/pkg/reflect/#Value.Pointer say about this. But the quote seems to indicate that one could get the same pointer for different functions, doesn't it? And if this is the case, GetFunctionName might r...
Catch Ctrl-C in C
...ote this answer seven years ago. Yes, language standards change. If you really must better the world, please add your new answer but leave mine as is. As the answer has my name on it, I'd prefer it to contain my words too. Thank you.
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Convert Elixir string to integer or float
...er directly. If you want to do that, see @Szymon Jeż answer with String.to_integer/1
– user4275029
Sep 26 '16 at 12:27
6
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Quora如何在快速开发中保持高品质代码 - 项目管理 - 清泛网 - 专注C/C++及内核技术
...模块/目录等级的代码“ownership”上添加标签，例如：
__reviewer__ = 'vanessa, kornel'
如果提交新变更，系统就自动会分析文件（或其上层目录），将新审查者的名字添加到提交数据中。我们还有额外的规则将代码审核派发给合适的...
How is Racket different from Scheme?
...and not R6RS and not a strict superset of either. I don't think it can be called 'Scheme' because it's not backwards compatible with any Scheme standard.
Most implementations offer extensions, but are otherwise backwards compatible, of course, the compiler that comes with Racket can also run in R5R...
Why use ICollection and not IEnumerable or List on many-many/one-many relationships?
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Usually what you choose will depend on which methods you need access to. In general - IEnumerable<> (MSDN: http://msdn.microsoft.com/en-us/library/system.collections.ienumerable.aspx) for a list of objects that only needs ...
What's the idiomatic syntax for prepending to a short python list?
... @MattM. If you insert at the front of a list, python has to move all the other items one space forwards, lists can't "make space at the front". collections.deque (double ended queue) has support for "making space at the front" and is much faster in this case.
– fejfo
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Create an array with random values
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var random_array = new Array(40).fill().map((a, i) => a = i).sort(() => Math.random() - 0.5); I think this does the same as above
– Jamie337nichols
Sep 16 '19 at 18:47
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