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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
...ster节点。
一旦Master节点故障，则会在其余节点中选举出一个新的Master节点。
并引导剩余节点连接到新的Master节点。这个过程对于应用是透明的。
2 Bully选举算法
Bully算法是一种协调者（主节点）竞选算法，主要思想是集...
CSS hack大全 - 创意 - 清泛网 - 专注C/C++及内核技术
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注意点：
网上很多资料中常常把!important也作为一个hack手段，其实这是一个误区。!important常常被我们用来更改样式，而不是兼容hack。造成这个误区的原因是IE6在某些情况下不主动识别!important,以至于常常被人误用做识别...
Is there a portable way to get the current username in Python?
...e that works under both Linux and Windows, at least). It would work like os.getuid :
12 Answers
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Python: How to get stdout after running os.system? [duplicate]
I want to get the stdout in a variable after running the os.system call.
6 Answers
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WhatsApp如何成为销售钻戒的店面？ - 资讯 - 清泛网 - 专注C/C++及内核技术
...凝视着一排璀璨夺目的珠宝，兴奋地选出他们最喜欢的那一个。另一种方式或许在现代生活中更为常见：一对恋人，每人都低头盯着自己的智能手机，窝在床上，跟钻戒销售人员聊着他们最新、最受欢迎的设计。这一切都在WhatsA...
How is Docker different from a virtual machine?
...ly known as libcontainer), which runs in the same operating system as its host. This allows it to share a lot of the host operating system resources. Also, it uses a layered filesystem (AuFS) and manages networking.
AuFS is a layered file system, so you can have a read only part and a write part wh...
Wi-Fi 是什么的缩写 - 程序人生、谈天论地 - 清泛IT论坛，有思想、有深度
... 802.11 标准的无线网络技术作为己任，因此他们认为需要一个朗朗上口的名字来代替拗口的专业术语（呃…什么？802.11b 直接序列扩频？那是什么东西…），以便这个概念能更好地在民间扩散。这时候，上图中出镜的联盟创始人...
How to check if a path is absolute path or relative path in cross platform way with Python?
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os.path.isabs returns True if the path is absolute, False if not. The documentation says it works in windows (I can confirm it works in Linux personally).
os.path.isabs(my_path)
...
Sound alarm when code finishes
...uency in Hz and the duration is in milliseconds.
On Linux and Mac
import os
duration = 1 # seconds
freq = 440 # Hz
os.system('play -nq -t alsa synth {} sine {}'.format(duration, freq))
In order to use this example, you must install sox.
On Debian / Ubuntu / Linux Mint, run this in your termin...
Copy file or directories recursively in Python
...yanything(src, dst):
try:
shutil.copytree(src, dst)
except OSError as exc: # python >2.5
if exc.errno == errno.ENOTDIR:
shutil.copy(src, dst)
else: raise
share
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