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Waiting until two async blocks are executed before starting another block
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10 Answers
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Printing everything except the first field with awk
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16 Answers
16
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List of lists into numpy array
...nacio Vazquez-Abrams will not work. Instead there are at least 3 options:
1) Make an array of arrays:
x=[[1,2],[1,2,3],[1]]
y=numpy.array([numpy.array(xi) for xi in x])
type(y)
>>><type 'numpy.ndarray'>
type(y[0])
>>><type 'numpy.ndarray'>
2) Make an array of lists:...
Get the latest record from mongodb collection
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142
This is a rehash of the previous answer but it's more likely to work on different mongodb vers...
List of All Locales and Their Short Codes?
...know about them when you write your application. My Windows 7 system has 211 locales installed (listed below), so you wouldn't likely write any custom code or translation specific to this many locales.
The most important thing for various versions of English is in formatting numbers and dates. Ot...
MongoDB副本集详解 优于以往的主从模式 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...为mongodb-linux-x86_64-2.6.0
由三台虚拟机搭建，配置为单核,1G内存。实验环境如下:
MongoDB的副本集不同于以往的主从模式。
在集群Master故障的时候，副本集可以自动投票，选举出新的Master，并引导其余的Slave服务器连接新的Master...
How can I get the intersection, union, and subset of arrays in Ruby?
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155
Utilizing the fact that you can do set operations on arrays by doing &(intersection), -(di...
Cartesian product of multiple arrays in JavaScript
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109
2020 Update: 1-line (!) answer with vanilla JS
Original 2017 Answer: 2-line answer with vanill...
Flatten nested dictionaries, compressing keys
...ms.append((new_key, v))
return dict(items)
>>> flatten({'a': 1, 'c': {'a': 2, 'b': {'x': 5, 'y' : 10}}, 'd': [1, 2, 3]})
{'a': 1, 'c_a': 2, 'c_b_x': 5, 'd': [1, 2, 3], 'c_b_y': 10}
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