Slides from the training on the topic "Python Programming Essentials"

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What is Python
Pavan Verma
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@YinYangPavan
Python Programming Essentials

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Hello World in Python

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Brief history of Python
 Invented by Guido Van Rossum in
early 90s
 Named after comedy group Monty
Python
 First public release in 1991
 Open source from beginning
 Managed by Python Software
foundation (PSF)
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Python Features
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• Python has relatively few keywords,
simple structure, and a clearly
defined syntax
Easy-to-learn
• Python lets you get more done with
less code and less time
Rapid development
• One of Python's greatest strengths
is the bulk of the library is
portable and cross-platform
compatible on *nix and windows
Powerful standard
library

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Python Features
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• Python interpreter lets you try out
code right away in its interactive
mode
Interactive mode
• Python can run on a wide variety of
platformsPortable
• Python is a dynamically typed
languages. Types are assigned at
run-time
Dynamically typed

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Who uses Python
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What do people use Python for
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Web and Internet Development
Desktop GUIs
Scientific and Numeric computing
Network Programming
Database Access

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Some interesting projects
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Python Community
 Very active communities around Python and
projects written in Python
 PyPi – the Python Package Index,
https://pypi.python.org/pypi
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How does Python compare with some
other popular languages?

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Python is better
 Faster to learn
 Portable code
 Much smaller and compact
code
 Automatic garbage collection
 Easy to find and install 3rd party
libraries
 More powerful standard library
 5-10 times higher programmer
productivity
C/C++ is better
 Faster
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Python vs C/C++

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Python is better
 Faster to learn
 Smaller and compact code
 3-5 times higher
programmer productivity
Java is better
 Faster
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Python vs Java

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Python is better
 More versatile, general
purpose language
 Easy to find and install 3rd
party libraries
PHP is better
 Faster to get started with
 Cheap web hosting
 Huge installed base
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Python vs PHP

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Python is better
 More tidy & readable code
 Proper support for objects
oriented programming
 More general purpose and
adopted in variety of
application domains
Perl is better
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Python vs Perl

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Python vs Ruby
 Python and Ruby have lot in common
 Both are widely adopted in variety of application
domains
 Both have popular and successful applications written
using them
 Both have very active and supportive communities
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Python Interpreter

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Python interpreter
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• The interpreter is a program which lets you
type in code and give outputs right away
• This is a very easy and effective way to learn
Python
• This is where you will end up spending most of
your time

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Sneak peak into an interpreter session
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>>> x = 25
>>> y = 10
>>> x - y
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>>> 4**2 # square of 4
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>>> print "Python rocks" # print a string
Python rocks
>>> print "Python rocks".upper()
PYTHON ROCKS

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Sneak peak into an interpreter session (2)
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>>> 100/12 # divison
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>>> colors = ['brown', 'black', 'orange']
>>> colors # a list of colors
['brown', 'black', 'orange']
>>>

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Awesome Standard Library
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• Python ships with an extensive standard
library
• Hundreds of modules for doing a variety
of things – interacting with the operating
system, filesystem, Internet, and more
• Well tested and widely used
• Can greatly help jump-start
development of your applications

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• We will be using Python 2.7.x but even Python
2.5 and above will work
• Examples, quiz and assignment all are meant
to be done in Python 2.x
• Please don’t use Python 3.x for this class due
to backward compatibility issue
Python Versions
 Python 2.x
 Python 3.x
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Summary
 Brief history of Python
 Python features
 Who uses Python
 What people use Python for
 Some interesting projects written in Python
 Comparison with other popular languages
 Python interpreter
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References
 List of application domains where Python is used
http://www.Python.org/about/apps/
 List of Internet companies that use Python http://www.quora.com/Python-
programming-language-1/Which-Internet-companies-use-Python
 Guido von Rossum personal home page http://www.Python.org/~guido/
 Reddit site http://www.reddit.com/
 Source code for reddit.com https://github.com/reddit/reddit
 Pinterest site https://www.pinterest.com/
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References (2)
 Blog post about Python in Disqus
http://blog.disqus.com/post/51155103801/trying-out-this-go-thing
 Blog post about Python in Instagram http://instagram-
engineering.tumblr.com/post/13649370142/what-powers-instagram-
hundreds-of-instances-dozens-of
 Pygtk website http://www.pygtk.org/
 TkInter GUI library https://wiki.Python.org/moin/TkInter
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References (3)
 PyGame Wikipedia page http://en.wikipedia.org/wiki/Pygame
 OpenStack project website http://www.openstack.org/
 Matplotlib website http://matplotlib.org/
 Scipy website http://www.scipy.org/
 Flask website http://flask.pocoo.org/
 TurboGears on Wikipedia http://turbogears.org/
 Django Project website https://www.djangoproject.com/
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