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How to slice an array in Bash
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317
See the Parameter Expansion section in the Bash man page. A[@] returns the contents of the arr...
Date vs DateTime
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131
No there isn't. DateTime represents some point in time that is composed of a date and a time. H...
Why does changing the returned variable in a finally block not change the return value?
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answered Apr 16 '13 at 7:13
Ted HoppTed Hopp
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How to raise a ValueError?
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answered Dec 8 '10 at 23:10
NPENPE
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Number of processors/cores in command line
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138
nproc is what you are looking for.
More here : http://www.cyberciti.biz/faq/linux-get-number-o...
PDO support for multiple queries (PDO_MYSQL, PDO_MYSQLND)
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As I know, PDO_MYSQLND replaced PDO_MYSQL in PHP 5.3. Confusing part is that name is still PDO_MYSQL. So now ND is default driver for MySQL+PDO.
Overall, to execute multiple queries at once you need:
PHP 5.3+
mysqlnd
Emulated prepared statements. Make sure PDO::ATTR_EMULATE_...
ZMQ: 基本原理 - 开源 & Github - 清泛网 - 专注C++内核技术
...据的编码(图像如何被序列化，RGB？CMYK?)等等。 第3点表达了这样一个事实：即使存在两个非常相同的（例如两家公司里的）商务逻辑部署，它们仍然形成了两个拓扑，除非它们相互通过数据通道连接。 为了直观地掌握拓...
What's the recommended approach to resetting migration history using Django South?
...venient, but doesn't
affect other apps) - thanks! – chrisv Mar 26 '13 at 9:09
Accepted answer follows below:
First, an answer by the South author:
As long as you take care to do it on all deployments simultaneously, there shouldn't be any problem with this. Personally, I'd do:
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Create list of single item repeated N times
....timeit('itertools.repeat(0, 10)', 'import itertools', number = 1000000)
0.37095273281943264
>>> timeit.timeit('[0] * 10', 'import itertools', number = 1000000)
0.5577236771712819
But wait - it's not a fair test...
>>> itertools.repeat(0, 10)
repeat(0, 10) # Not a list!!!
The...