Python Lecture Notes PDF

Introduction to Python Python Overview  Job Trend Per the indeed.com, percentage growth of Python is 500 times more than it’s peer Languages. http://www.indeed.com/jobtrends?q=Perl%2C+.Net%2C+Python%2Cjava&l=&relative=1  Job In B...

Introduction to Python Python Overview  Job Trend Per the indeed.com, percentage growth of Python is 500 times more than it’s peer Languages. http://www.indeed.com/jobtrends?q=Perl%2C+.Net%2C+Python%2Cjava&l=&relative=1  Job In Big Data space Source: http://www.forbes.com/sites/louiscolumbus/2014/12/29/where-big-data-jobs-will-be-in- 2015/  What is Python? Python is a high-level programming language which is:  Interpreted: Python is processed at runtime by the interpreter.(NEXT SLIDE)  Interactive: You can use a Python prompt and interact with the interpreter directly to write your programs.  Object-Oriented: Python supports Object-Oriented technique of programming.  Beginner’s Language: Python is a great language for the beginner-level programmers and supports the development of a wide range of applications.  Interpreters VersusCompilers An INTERPRETER is a A COMPILER is a computer program, computer program that which coverts each transforms code written high-level program in a high-level statement into the programming language machine code. into the machine code.  Python Features  Easy to learn, easy to read and easy to maintain.  Portable: It can run on various hardware platforms and has the same interface on all platforms.  Extendable: You can add low-level modules to the Python interpreter.  Scalable: Python provides a good structure and support for large programs.  Python has support for an interactive mode of testing and debugging.  Python has a broad standard library cross-platform.  Everything in Python is an object: variables, functions, even code. Every object has an ID, a type, and a value.  More Features..  Python provides interfaces to all major commercial databases.  Python supports functional and structured programming methods as well as OOP.  Python provides very high-level dynamic data types and supports dynamic type checking.  Python supports GUI applications  Python supports automatic garbage collection.  Python can be easily integrated with C, C++, and Java.  Why Python Easy to read  Python scripts have clear syntax, simple structure and very few protocols to remember before programming. Easy to Maintain  Python code is easily to write and debug. Python's success is that its source code is fairly easy-to-maintain. Portable  Python can run on a wide variety of Operating systems and platforms and providing the similar interface on all platforms. Broad Standard Libraries  Python comes with many prebuilt libraries apx. 21K High Level programming  Python is intended to make complex programming simpler. Python deals with memory addresses, garbage collection etc internally. Interactive  Python provide an interactive shell to test the things before implementation. It provide the user the direct interface with Python. Database Interfaces  Python provides interfaces to all major commercial databases. These interfaces are pretty easy to use. GUI programming  Python supports GUI applications and has framework for Web. Interface to tkinter, WXPython, DJango in Python make it.  History of Python  Python was conceptualized by Guido Van Rossum in the late 1980s.  Rossum published the first version of Python code (0.9.0) in February 1991 at the CWI (Centrum Wiskunde & Informatica) in the Netherlands , Amsterdam.  Python is derived from ABC programming language, which is a general-purpose programming language that had been developed at the CWI.  Rossum chose the name "Python", since he was a big fan of Monty Python's Flying Circus.  Python is now maintained by a core development team at the institute, although Rossum still holds a vital role in directing its progress. https://en.wikipedia.org/wiki/Guido_van_Rossum#/media/File:Guido_van_Rossum_OSCON_2006.jpg  Python Versions Release dates for the major and minor versions:  Python 1.0 - January 1994  Python 1.5 - December 31, 1997  Python 1.6 - September 5, 2000  Python 2.0 - October 16, 2000  Python 2.1 - April 17, 2001  Python 2.2 - December 21, 2001  Python 2.3 - July 29, 2003  Python 2.4 - November 30, 2004  Python 2.5 - September 19, 2006  Python 2.6 - October 1, 2008  Python 2.7 - July 3, 2010  Python Versions Release dates for the major and minor versions:  Python 3.0 - December 3, 2008  Python 3.1 - June 27, 2009  Python 3.2 - February 20, 2011  Python 3.3 - September 29, 2012  Python 3.4 - March 16, 2014  Python 3.5 - September 13, 2015  Python 3.6 - December 23, 2016  Python 3.7 – June 27, 2018  Python 3.12.5 - August 6 2024  Key Changes in Python 3.0  In Python 3, we should enclose the exception argument in parentheses. Old: New:  In Python 3, we have to use the as keyword now in the handling of exceptions. Old: New:  The division of two integers returns a float instead of an integer. "//" can be used to have the "old" behavior. Python vs. Java Code Examples  Python vs. Java  Hello World Java Python  String Operations Java Python  Python vs. Java  Collections Java Python  Python vs. Java  Class and Inheritance Java Python  Python Useful Tools  Useful Tools  Python IDEs Vim Eclipse with PyDev Sublime Text Emacs Komodo Edit PyCharm  Useful Tools  Python Web Frameworks Django Flask Pylons Pyramid TurboGears Web2py Who Uses Python?  Organizations Use Python Web Development :Google, Yahoo Games :Battlefield 2, Crystal Space Graphics :Walt Disney Feature Animation, Blender 3D Science :National Weather Service, NASA, Applied Maths Software Development :Nokia, Red Hat, IBM Education :University of California-Irvine, SchoolTool Government :The USA Central Intelligence Agency (CIA)  5 Reasons to choose Python as 1st Language Python is fun. : Python is a relatively efficient language, requiring fewer lines of code to produce results. Python is easy to set up. : Some languages, such as Java or C#, have much higher setup and maintenance overhead. Python is not going away anytime soon. : In fact, Python has become the most frequently used teaching language at major universities. Python is a tool of choice for doing some very big things. : For instance: YouTube, Google, Instagram, Pinterest, Quora, Reddit, Dropbox, Civilization IV, and more. It’s also widely used for penetration testing, data analysis, scientific computing, and more. Python jobs pay well, and python programmers are in high demand. Thank You