Category: Python

Python

Installing IPython Notebook on OS X

Post author By masnun
Post date July 22, 2014
4 Comments on Installing IPython Notebook on OS X

If you do not know what is IPython Notebook, please checkout the link here – http://ipython.org/notebook.html. IPython is an awesome tool that allows you to combine Python codes with rich text to create meaningful & interactive contents.

Here’s a quick demonstration:

In this post, I am going to share what I did to setup IPython Notebook on my OS X. These are the commands I used. Homebrew was used to install libraries/dependencies. Pip was used to install Python packages.

pip install ipython
pip install tornado 
brew install zeromq --universal
pip install pyzmq
pip install pygments
brew install freetype libpng pyqt
pip install numpy
pip install scipy
pip install matplotlib
pip install jinja2

pip install ipython

pip install tornado

brew install zeromq --universal

pip install pyzmq

pip install pygments

brew install freetype libpng pyqt

pip install numpy

pip install scipy

pip install matplotlib

pip install jinja2

If you use the same commands and everything works fine, you will have a working installation of IPython Notebook. You can launch the notebook web server using the following command:

ipython notebook

1	ipython notebook

This will launch the server and open your default web browser 🙂 Please note that the notebook will use your current directory as the root while displaying the files and directories. I created a dedicated directory inside my Google Drive to store my notebooks. So I created an alias for always starting the notebook server pointed to that directory. I put this in my .zshrc:

alias pynb="ipython notebook --notebook-dir='/Users/masnun/Google Drive/IPython

1	alias pynb="ipython notebook --notebook-dir='/Users/masnun/Google Drive/IPython

Now from any place, I can issue this command to run the server:

pynb

pynb

I am currently playing with both IPython and the IPython Notebook. Both are awesome 🙂

Linux Python

Python and Django on Vagrant

Post author By masnun
Post date June 27, 2014
8 Comments on Python and Django on Vagrant

Well, this is going to be another straight forward post with loads of shell commands. The background is simple, I love OS X for the many apps it offers but at the same time I always had the joy of developing on a Linux machine. I decided to use Vagrant to have one central box for my projects. I use separate vagrant boxes for complicated projects. But didn’t like the idea of having individual boxes for simple ones.

I work on Python and Django a lot. So in this post I am going to document my setup.

Vagrant File:

# I have assigned a private IP to the box
# I have assigned a hostname to it.
# I am using Ubuntu Precise Pangolin 64 bit as my base box (which I already have added)

# -*- mode: ruby -*-
# vi: set ft=ruby :

# Vagrantfile API/syntax version. Don't touch unless you know what you're doing!
VAGRANTFILE_API_VERSION = "2"

Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|
  
  config.vm.box = "precise64"

  config.vm.network :private_network, ip: "192.168.234.131"
  config.vm.hostname = "tardis.dev"
end

# -*- mode: ruby -*-

# vi: set ft=ruby :

# Vagrantfile API/syntax version. Don't touch unless you know what you're doing!

VAGRANTFILE_API_VERSION = "2"

Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|

config.vm.box = "precise64"

config.vm.network :private_network, ip: "192.168.234.131"

config.vm.hostname = "tardis.dev"

end

Hosts File (/etc/hosts):

192.168.234.131 tardis.dev

1	192.168.234.131 tardis.dev

After I setup the box, I logged in using SSH:

vagrant ssh

1	vagrant ssh

Now, the usual Ubuntu setup.

sudo apt-get install python-pip
sudo pip install virtualenv
mkdir ~/.virtualenvs
sudo pip install virtualenvwrapper
sudo apt-get install python-dev libmysqlclient-dev libpq-dev

sudo apt-get install python-pip

sudo pip install virtualenv

mkdir ~/.virtualenvs

sudo pip install virtualenvwrapper

sudo apt-get install python-dev libmysqlclient-dev libpq-dev

Bash Profile in the Ubuntu machine:

# To make the Django built in server available from outside the box I need to run it on 0.0.0.0 so that it listens on all interfaces. So I added a handy alias.

# Added the virtualenv stuff to the profile

# Virtual Env
export WORKON_HOME=~/.virtualenvs
. /usr/local/bin/virtualenvwrapper.sh

# Aliases
alias djrun="python manage.py runserver 0.0.0.0:8000"

# Virtual Env

export WORKON_HOME=~/.virtualenvs

. /usr/local/bin/virtualenvwrapper.sh

# Aliases

alias djrun="python manage.py runserver 0.0.0.0:8000"

Bootstrapping a project:

mkvirtualenv project
cd ~/project
pip install -r requirements.txt

## Later
workon env_name
djrun

mkvirtualenv project

cd ~/project

pip install -r requirements.txt

## Later

workon env_name

djrun

Now the app would be available on: http://tardis.dev:8000

I also modify the ~/.virtualenvs//bin/postactivate script to cd into the project source directory. Saves time when I hit “workon env_name”

That’s it 🙂

Python

Embed a Python REPL in your program

Post author By masnun
Post date January 9, 2014

So you love the Django shell? The interactive prompt that has your Django stuff loaded and ready for some quick prototyping? You always wanted to embed something similar in your Python apps too? Well, it’s painlessly simple with the “code” module. It offers us the “InteractiveConsole” class which we can extend to quickly get a REPL which is basically the Python REPL with our customizations. The code is heavily documented. Going through it should be adequate to understand whats going on:

from code import InteractiveConsole

# Our own console implementation
# Subclasses object since we want to use new style classes

class MySuperCoolConsole(InteractiveConsole, object):

    # Redefine interact method to add our own banners
    # Subclassing was necessary, we could pass it to
    # a new InteractiveConsole instance directly

    def interact(self):
        banner = "=====" * 3 + "\n" + "SUPER COOL CONSOLE" + "\n" + "VERSION: 0.1" + "\n" + "=====" * 3
        super(MySuperCoolConsole, self).interact(banner)

    # Customize the prompt
    def raw_input(self, prompt=""):
        prompt = "[=>] "
        return raw_input(prompt)


# We want to inject some preset variables ("names" in Python)
# Grab the locals(), add our own to it
local_names = locals()
local_names['name'] = 'masnun'
local_names['email'] = 'masnun@transcendio.net'

# Pass the modified locals, call interact to launch REPL
console = MySuperCoolConsole(locals=local_names)
console.interact()

from code import InteractiveConsole

# Our own console implementation

# Subclasses object since we want to use new style classes

class MySuperCoolConsole(InteractiveConsole, object):

# Redefine interact method to add our own banners

# Subclassing was necessary, we could pass it to

# a new InteractiveConsole instance directly

def interact(self):

banner = "=====" * 3 + "\n" + "SUPER COOL CONSOLE" + "\n" + "VERSION: 0.1" + "\n" + "=====" * 3

super(MySuperCoolConsole, self).interact(banner)

# Customize the prompt

def raw_input(self, prompt=""):

prompt = "[=>] "

return raw_input(prompt)

# We want to inject some preset variables ("names" in Python)

# Grab the locals(), add our own to it

local_names = locals()

local_names['name'] = 'masnun'

local_names['email'] = 'masnun@transcendio.net'

# Pass the modified locals, call interact to launch REPL

console = MySuperCoolConsole(locals=local_names)

console.interact()

What did we do? We subclassed InteractiveConsole to create our own implementation. And then ran it 🙂

Test run outputs:

~/Codes/py ⮀ python test.py
===============
SUPER COOL CONSOLE
VERSION: 0.1
===============
[=>] email
'masnun@transcendio.net'
[=>] name
'masnun'
[=>] print 'those were injected'
those were injected
[=>] print 'nice, no?'
nice, no?
[=>] 2 + 3
5
[=>] ^D
 ~/Codes/py ⮀

~/Codes/py ⮀ python test.py

===============

SUPER COOL CONSOLE

VERSION: 0.1

===============

[=>] email

'masnun@transcendio.net'

[=>] name

'masnun'

[=>] print 'those were injected'

those were injected

[=>] print 'nice, no?'

nice, no?

[=>] 2 + 3

[=>] ^D

~/Codes/py ⮀

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