AaronPhalen

# python_itertools.py highlights useful functions in python's itertools module
# Influenced by  Raymond Chandler III pyvideo.org/video/2275 (Super Advanced Python Concepts)
# Author: Aaron Phalen | Twitter: @aaron_phalen | Email: [email protected]
from itertools import chain, combinations, permutations, compress, count, cycle, groupby

# 1.  Itertools Chain Example
letters = ["a", "b", "c", "d"]
numbers = [1, 2, 3]
both = chain(letters, numbers)

AaronPhalen

# singleton.py illustrates how to use singleton design pattern in python
# influenced by Trevor Pain https://www.youtube.com/watch?v=6IV_FYx6MQA
# Author: Aaron Phalen | Twitter: @aaron_phalen | Email: [email protected]

# In python, a singleton is a design patter which allows once instance of a class to be invoked
# or stored in memory.

class Singleton(object):
    _instance = None
    def __new__(self):

AaronPhalen

Author: Aaron Phalen | Twitter: @aaron_phalen | email: [email protected]

Basic Linux Shell Commands (Ubuntu 12.04)
==========================================

1. grep command
---------------
The grep commands allows for search functionality when working with
output strings, files, or directories.

AaronPhalen

# Author: Aaron Phalen | Twitter: @aaron_phalen | Email: [email protected]
# Example of python class factory

# Dynamically create classes
Class1 = type("Class1", (), {"name": "class 1"}) 
Class2 = type("Class2", (), {"name": "class 2"})

# create factory class
class SampleClass(object):
      """class factory"""

AaronPhalen

# Author: Aaron Phalen | Twitter: @aaron_phalen | Email: [email protected]

# Builder Design Pattern In Python

# Creating xml without builder as constract to example
from lxml import etree
root = etree.Element("root")
child = etree.Element("child")
child.text = "sample text"
root.append(child)

AaronPhalen

#Author: Aaron Phalen | Twitter: @aaron_phalen | Email: [email protected]
# Useful modules and examples from python's collections library
from collections import namedtuple

# 1. Python collections namedtuple
Parameters = namedtuple("Parameters", "x y z")
parameters = Parameters(x="1", y="2", z="3")

# Output
print parameters

AaronPhalen

Author: Aaron Phalen | Twitter: @aaron_phalen | Email: [email protected]

#Useful Vi Editor Commands

1. :w --> save to a file
2. :q --> quit out of editor file
3. :q! --> quit out of editor without saving file
4. w --> move one word forward at a time in file
5. b --> move one word back at a time in file
6. :wq --> save file and quit editor

AaronPhalen

# Author: Aaron Phalen | Twitter: @aaron_phalen | Email: [email protected]
# Example of parsing xml in python with various librarie: read, write, modify, io

try:
    import xml.etree.cElementTree as ET
except:
    import xml.etree.ElementTree as ET
from xml.dom import minidom

AaronPhalen

Linux File Remove Command And Recovery
======================================

Motivation:
Since using an Ubuntu 12.04 server for the last couple years, I had not once erroneously
keystroked a faulty rm command. As a Linux users knows, the rm commands is used to remove a file or directory.
Futhermore, like most Linux commands various options can be added, such as: -r, -f, -i, etc. 
While not pertinent to the discusion, I will define these quickly for the inquisitve reader: 
   
   1. -r recursively delete directory and child files/directories.

AaronPhalen

Author: Aaron Phalen | Twitter: @aaromn_phalen | Email: [email protected]

Basic SSH Configuration Commands
================================

1. Installation
  a) sudo apt-get install openssh-server
  b) sudo apt-get install openssh-client
  
2. Configuration