Author: masnun

Object Oriented Programming in Python: Bangla Screencast

Post author By masnun
Post date July 31, 2014
3 Comments on Object Oriented Programming in Python: Bangla Screencast

Video is available in HD

সংযুক্তি – ১

স্ক্রীনকাস্টে প্রাইভেট ভ্যারিয়েবল বা ডাটা হাইডিং এর উদাহরন দেখানোর সময় ক্লাস লেভেল ভ্যারিয়েবল ব্যবহার করা হয়েছে । ইনস্ট্যান্স ভ্যারিয়েবল এর ক্ষেত্রেও একই নিয়ম প্রযোজ্য । এখানে কোড স্যাম্পল দেওয়া হলো:

class User(object):

    def __init__(self):
        self.__name = "masnun"


# print User().__name --> this one would fail
print User()._User__name

class User(object):

def __init__(self):

self.__name = "masnun"

# print User().__name --> this one would fail

print User()._User__name

সংযুক্তি – ২

ক্লাস নির্ভর মেটাক্লাস ইম্প্লিমেন্টেশন এবং একটি কাল্পনিক প্রয়োগ দেখার জন্য এই ভিডিও টি দেখতে পারেন – Python – Metaprogramming

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 🙂

Javascript Personal

Tessel: Review

Post author By masnun
Post date July 20, 2014

Tessel is a micro controller that runs JavaScript. It is NodeJS compatible – that means you can take advantages of npm and all the NodeJS awesomeness with it. The key attraction for me was the built in Wifi, makes it very easy to connect to the internet. Tessel has a good collection of modules which you can connect to the board to extend it’s functionality. The modules are listed here: https://tessel.io/modules. Each module has a dedicated npm package. You just have to install the package and require it to interact with the module. Cool, no?

I ordered a Tessel from their website on June 14. I got the board at hand today, July 20. They shipped via DHL global mail.

Here’s the tessel main board:

I also purchased a GPRS module to interact with mobile networks. Here’s a photo of the module connected to the main board:
Tessel with GPRS Module

Setting It Up

Setting up was easy. I already has NodeJS installed. I installed the tessel command line tool.

npm install -g tessel

1	npm install -g tessel

After tessel is installed, I tried listing the devices:

 ~/Projects/tessel ⮀ tessel list
INFO TM-00-04-f000da30-00574f44-32b02586

1 2	~/Projects/tessel ⮀ tessel list INFO TM-00-04-f000da30-00574f44-32b02586

Then I copied the example blinking codes and tried them out. All worked fine. So my tessel was working! Then I tried listing the available wifi networks:

tessel wifi -l

1	tessel wifi -l

I connected to my home wifi:

tessel wifi -n "TARDIS Console" -p "OnlyAnIdiotWouldPostHisRealPwdHere"

1	tessel wifi -n "TARDIS Console" -p "OnlyAnIdiotWouldPostHisRealPwdHere"

It connected to the Wifi just like that! Awesome!

Then I tested out the instructions on the “Tweet” section which uses the recently connected WiFi to send out a tweet.

Hello @masnun. This is your #Tessel speaking.

— Tessel (@TesselTweet) July 20, 2014

The WiFi is working excellent!

The GPRS Module

Now I connected the GPRS module and tested out the sample codes. I used a spare Banglalink SIM to send out the SMS. It turns out that you don’t need to type the number in international format. The 017******** format works too 🙂

tesla

Just a quick note: If you follow the official example (it sends a text on gprs.ready event), and then kill the process by hitting Ctrl + C, you might have issues controlling the GPRS module without restarting it. So I think for testing, we can use the Tessel REPL from the command line:

tessel repl

1	tessel repl

Recent Posts

Recent Comments

Archives

Categories