Dong Ma larainema

## openstack-delete-instance.sh
#!/bin/bash
#
#    This program is free software: you can redistribute it and/or modify
#    it under the terms of the GNU General Public License as published by
#    the Free Software Foundation, either version 3 of the License, or
#    (at your option) any later version.
#
#    This program is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

## py3.5_ubuntu_14.04.txt
Felix Krull runs a PPA offering basically any version of Python (seriously, there is 2.3.7 build for vivid...) for many Ubuntu releases at

https://launchpad.net/~fkrull/+archive/ubuntu/deadsnakes

Do the usual:

sudo add-apt-repository ppa:fkrull/deadsnakes
sudo apt-get update
sudo apt-get install python3.5
It will not overwrite your existing python3.4 which is still symlinked as python3. If you want python3.5 to be the default python3, change the symlink

## Stack.py
Class Stack():
  def __init__(self,size):
    self.size=size
    self.stack=[]
    self.top=-1

  def push(self,n):
    if self.isfull():
      print "Out of range"
    else:

## allperms.py
def allperm(inputstr):
    for i in range(len(inputstr)):
        yield(inputstr[i])
        for s in allperm(inputstr[:i] + inputstr[i+1:]):
            yield(inputstr[i] + s)
inputstr = "abc"
for n in allperm(inputstr):
        print n
import sys
from itertools import permutations

## drawline
<html>
        <head>
                <title>Line Chart</title>
                <script src="scripts/Chart.js"></script>
        </head>
        <body>
                <div style="width:60%">
                        <div>
                                <canvas id="canvas" height="450" width="600"></canvas>
                        </div>

## awk
awk 用法：awk ' pattern {action} '

变量名	 含义
ARGC	 命令行变元个数
ARGV	 命令行变元数组
FILENAME	当前输入文件名
FNR	 当前文件中的记录号
FS	 输入域分隔符，默认为一个空格
RS	 输入记录分隔符
NF	 当前记录里域个数

## date
date +%s   可以得到UNIX的时间戳;
用shell将时间字符串与时间戳互转：
  date -d "2010-10-18 00:00:00" +%s         输出形如：1287331200
而时间戳转换为字符串可以这样做：
  date -d @1287331200  "+%Y-%m-%d"    输出形如：2010-10-18
如果需要得到指定日期的前后几天，可以：
  1、seconds=`date -d "2010-10-18 00:00:00" +%s`       #得到时间戳
  2、seconds_new=`expr $seconds + 86400`                   #加上一天的秒数86400
  3、date_new=`date -d @$seconds_new "+%Y-%m-%d"`   #获得指定日前加上一天的日前
	Felix Krull runs a PPA offering basically any version of Python (seriously, there is 2.3.7 build for vivid...) for many Ubuntu releases at

	https://launchpad.net/~fkrull/+archive/ubuntu/deadsnakes

	Do the usual:

	sudo add-apt-repository ppa:fkrull/deadsnakes
	sudo apt-get update
	sudo apt-get install python3.5
	It will not overwrite your existing python3.4 which is still symlinked as python3. If you want python3.5 to be the default python3, change the symlink
	Class Stack():
	def __init__(self,size):
	self.size=size
	self.stack=[]
	self.top=-1

	def push(self,n):
	if self.isfull():
	print "Out of range"
	else:
	def allperm(inputstr):
	for i in range(len(inputstr)):
	yield(inputstr[i])
	for s in allperm(inputstr[:i] + inputstr[i+1:]):
	yield(inputstr[i] + s)
	inputstr = "abc"
	for n in allperm(inputstr):
	print n
	import sys
	from itertools import permutations
	<html>
	<head>
	<title>Line Chart</title>
	<script src="scripts/Chart.js"></script>
	</head>
	<body>
	<div style="width:60%">
	<div>
	<canvas id="canvas" height="450" width="600"></canvas>
	</div>
	awk 用法：awk ' pattern {action} '

	变量名含义
	ARGC 命令行变元个数
	ARGV 命令行变元数组
	FILENAME 当前输入文件名
	FNR 当前文件中的记录号
	FS 输入域分隔符，默认为一个空格
	RS 输入记录分隔符
	NF 当前记录里域个数
	date +%s 可以得到UNIX的时间戳;
	用shell将时间字符串与时间戳互转：
	date -d "2010-10-18 00:00:00" +%s 输出形如：1287331200
	而时间戳转换为字符串可以这样做：
	date -d @1287331200 "+%Y-%m-%d" 输出形如：2010-10-18
	如果需要得到指定日期的前后几天，可以：
	1、seconds=`date -d "2010-10-18 00:00:00" +%s` #得到时间戳
	2、seconds_new=`expr $seconds + 86400` #加上一天的秒数86400
	3、date_new=`date -d @$seconds_new "+%Y-%m-%d"` #获得指定日前加上一天的日前