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#Newbie programmer
def factorial(x):
    if x == 0:
        return 1
    else:
        return x * factorial(x - 1)
print factorial(6)


#First year programmer, studied Pascal

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#Person
class Person
end

#class method
class Person
  def self.address
    puts "hangzhou"
  end
end

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#0> non-block call

Thread.new do
  blahbla...
end

#1> 4 simple ways to call shell or cmd

`ps aux`

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def block_new
  puts Proc.new.call
end

block_new{"hello"}

#slow practice
def herp_pass_block(&block)
  derp_call_block &block
end

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• gcc -M hello.c 可以得到某文件依赖的头文件。

• grep processor /proc/cpu_info 显示当前的CPU数目

• sudo shutdown -r now 重启机器

• sshfs yourname@host:/path/to/your/dir ~/local sshfs挂载到本地

• sudo -u fleuria bash: 切换用户

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Ultimate OpenStack IceHouse Guide

This is a Quick Guide to deploy OpenStack IceHouse on top of Ubuntu 14.04, it is IPv6-Ready!

It is compliant with OpenStack's official documentation (docs.openstack.org).

The tenant's subnets are based on Neutron, with ML2 plugin and Single Flat Network topology, dual-stacked.

The Single Flat Network is the simplest network topology supported by OpenStack (I think). So, it is easier to understand and follow.

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from sre_parse import Pattern, SubPattern, parse as sre_parse
from sre_compile import compile as sre_compile
from sre_constants import BRANCH, SUBPATTERN


class Scanner(object):

    def __init__(self, tokens, flags=0):
        subpatterns = []
        pat = Pattern()

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分辨需要设置的代理

• HTTP 形式：

  git clone https://github.com/owner/git.git

• SSH 形式：

  git clone git@github.com:owner/git.git

一、HTTP 形式

走 HTTP 代理