A simple getting started sample for ZeroMQ in Python. We will implement a Echo Server and Echo Client.

echo_server.py

import zmq

context = zmq.Context()
socket = context.socket(zmq.REP)
socket.bind("tcp://127.0.0.1:5000")

while True:
    msg = socket.recv()
    print "Got", msg
    socket.send(msg)

echo_client …

I came across an interesting maths tip, which I couldn't resist sharing.

Turning a fraction to a decimal is a childs' play, with a simple division. The trick is on restoring the fraction back from the decimal that has a repeating numbers.

Let us take a decimal "0.4545454545..."

Pick …

Better not to ask feedback, if you don't respect it.

It is the feedback which managers' ask the team. Feedback about work, people, environment and organization. Getting feedback from people generally motivates, as it makes people feel better that they are being heard.

Though it is mandatory for the …

With s3cmd to get files from S3 to EC2 I was getting this error "The difference between the request time and the current time is too large" and the command got terminated.

Found out that the time on EC2 instance was laging too much and wondered about the cause of …

While developing a module that requires to send emails, using actual email servers would be an overhead. They might introduce network latency, possible spam filtering etc. All end up retarding productivity.

We have smtpd.DebuggingServer that could be used as a local email server. All emails that are sent to …

While writing query using hibernate, I always tend to query based on table name and end up getting QuerySyntaxException

org.hibernate.hql.internal.ast.QuerySyntaxException: foo is not mapped [from foo]
    at org.hibernate.hql.internal.ast.util.SessionFactoryHelper.requireClassPersister(SessionFactoryHelper.java:180)
    at org.hibernate.hql.internal.ast.tree …

Auto generating a random clean URL (slug URL) for django web application. In URL www.website.com/app/d4Ers the last part is auto generated random string.

We need to first install the following package

$ sudo pip install django-autoslug

then import the package

from autoslug.fields import AutoSlugField

In the …

GIT repo's gitignore file for the python django projects I use. Though it is not extensive, I would update as I encounter new formats.

*.py[cod]

# Packages
*.egg
*.egg-info
dist
build
eggs
parts
bin
var
sdist
develop-eggs
.installed.cfg
lib
lib64
__pycache__

# Installer logs
pip-log.txt

# Unit test / coverage reports …

After some exploration, I could successfully connet to the internet with Tata Photon Plus from my Pi. Though with Raspbian, it is not as straight forward as it is with any other Linux varient.

There are many options available for connecting to the internet, based on the available infrastructure. In …

In this post, I'll explain how to setup a peer-to-peer local network between Windows 7 machine and the Raspberry Pi. The raspbian version I used is 2012-12-16-wheezy-raspbian.

For networking we require an ethernet crossover cable. (Some say that pi does automatic crossover and hence straight cable is sufficient, however, I …