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常用Linux命令详解（持续更新） - 更多技术 - 清泛网 - 专注C/C++及内核技术
...netstat等。一、注销，关机，重启，新建用户、删除用户
1. 注销系统的命令
logout 、exit
这两个命令都可以用来退出当前所登录的服务器，若想再次进入服务器需要重新输入用户名和密码
2．关机或重新启动的命令
shutdown
用来...
How to make an element in XML schema optional?
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191
Try this
<xs:element name="description" type="xs:string" minOccurs="0" maxOccurs="1" />...
TLSF源码及算法介绍 - 开源 & Github - 清泛网 - 专注C/C++及内核技术
...是一种用于实时操作系统的内存分配算法，时间复杂度 O(1)，在内存碎片问题上表现良好，可以将它看做是一个动态管理内存的内存池，提供分配及回收内存的方法，并能够进行内存碎片化整理。它的特点在于：
可以预期的分...
Center image horizontally within a div
...
21 Answers
21
Active
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How can I make setuptools install a package that's not on PyPI?
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156
The key is to tell easy_install where the package can be downloaded. In this particular case,...
Accessing class variables from a list comprehension in the class definition
...lowing will fail:
class A:
a = 42
b = list(a + i for i in range(10))
So, to summarize: you cannot access the class scope from functions, list comprehensions or generator expressions enclosed in that scope; they act as if that scope does not exist. In Python 2, list comprehensions were ...
promise already under evaluation: recursive default argument reference or earlier problems?
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164
Formal arguments of the form x=x cause this. Eliminating the two instances where they occur w...
How to sort a dataFrame in python pandas by two or more columns?
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As of the 0.17.0 release, the sort method was deprecated in favor of sort_values. sort was completely removed in the 0.20.0 release. The arguments (and results) remain the same:
df.sort_values(['a', 'b'], ascending=[True, False])
Y...
What is a bank conflict? (Doing Cuda/OpenCL programming)
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105
For nvidia (and amd for that matter) gpus the local memory is divided into memorybanks. Each b...
CSS 3 slide-in from left transition
...n hover)
Demo One
Relevant Code
.wrapper:hover #slide {
transition: 1s;
left: 0;
}
In this case, Im just transitioning the position from left: -100px; to 0; with a 1s. duration. It's also possible to move the element using transform: translate();
CSS animation
Demo Two
#slide {
...