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Pandas: drop a level from a multi-level column index?
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321
You can use MultiIndex.droplevel:
>>> cols = pd.MultiIndex.from_tuples([("a", "b"), ("...
How to print last two columns using awk
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194
You can make use of variable NF which is set to the total number of fields in the input recor...
Find indices of elem>me m>nts equal to zero in a NumPy array
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numpy.where() is my favorite.
>>> x = numpy.array([1,0,2,0,3,0,4,5,6,7,8])
>>> numpy.where(x == 0)[0]
array([1, 3, 5])
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项目管理实践教程一、工欲善其事，必先利其器【Basic Tools】 - 项目管理 -...
...首先安装一些必须的软件，主要有下面的4个，其中软件1和2使用在服务器机上，软件3和4安装在客户端机上。另外，我们还有用到MSBui 今天，我们首先安装一些必须的软件，主要有下面的4个，其中软件1和2使用在服务器机上，...
What is Weak Head Normal Form?
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These expressions are all in normal form:
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(2, "hello")
\x -> (x + 1)
These expressions are not in normal form:
1 + 2 -- we could evaluate this to 3
(\x -> x + 1) 2 -- we could apply the function
"he" ++ "llo" -- we could apply the (++)
(1 + 1, 2 + 2) ...
C++常用排序算法汇总 - C/C++ - 清泛网 - 专注C/C++及内核技术
...堆排序(HeapSort)，插入排序(InsertSort)，希尔排序(ShellSort) 1、选择排序(SelectSort)
/************************************
* 简单选择排序
* 稳定排序，O{n^2} ~ O{n^2}
* 从首位开始，循环一次找出一个比首位小的值，交换
*
* https://www.tsi...
SQL: capitalize first letter only [duplicate]
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190
Are you asking for renaming column itself or capitalise the data inside column? If its data yo...
Creating datafram>me m> from a dictionary where entries have different lengths
Say I have a dictionary with 10 key-value pairs. Each entry holds a numpy array. However, the length of the array is not the sam>me m> for all of them.
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Understanding dict.copy() - shallow or deep?
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1010
By "shallow copying" it m>me m>ans the content of the dictionary is not copied by value, but just ...
How to profile a bash shell script slow startup?
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132
If you have GNU date (or another version that can output nanoseconds), do this at the beginnin...