introduction to python in computer graphics.pptx

INTRODUCTION
TO
PYTHON
Session-1
M. SUJITH KUMAR
sujithmuramshetti@gmail.com

Agenda
 What is Python…?
 Differences between program and scripting language
 History of Python
 Scope of Python
 Why do people use Python?
 Installing Python IDE
 Who uses python today
 What can I do with python
 A Sample Code
 Python code execution
 Running Python

What is Python…?
 Python is a general purpose programming language that is
often applied in scripting roles.
 So, Python is programming language as well as scripting
language.
 Python is also called as Interpreted language

Differences between program and
scripting language
Program Scripting
 a program is executed (i.e.
the source is first compiled,
and the result of that
compilation is expected)
 A "program" in general, is a
sequence of instructions
written so that a computer
can perform certain task.
 a script is interpreted
 A "script" is code written in
a scripting language. A
scripting language is nothing
but a type of programming
language in which we can
write code to control
another software application.

History
 Invented in the Netherlands, early 90s by Guido van Rossum
 Python was conceived in the late 1980s and its
implementation was started in December 1989
 Guido Van Rossum is fan of ‘Monty Python’s Flying
Circus’, this is a famous TV show in Netherlands
 Named after Monty Python
 Open sourced from the beginning

Why was python created?
"My original motivation for creating Python was
the perceived need for a higher level language in
the Amoeba [Operating Systems] project.
I realized that the development of system
administration utilities in C was taking too long.
Moreover, doing these things in the Bourne shell
wouldn't work for a variety of reasons. ...
So, there was a need for a language that would
bridge the gap between C and the shell”
- Guido Van Rossum

Scope of Python
 Science
- Bioinformatics
 System Administration
-Unix
-Web logic
-Web sphere
 Web Application Development
-CGI
-Jython – Servlets
 Testing scripts

Why do people use Python…?
The following primary factors cited by Python users
seem to be these:
 Python is object-oriented
Structure supports such concepts as polymorphism, operation
overloading, and multiple inheritance.
 Indentation
Indentation is one of the greatest future in Python.
 It's free (open source)
Downloading and installing Python is free and easy
Source code is easily accessible

 It's powerful
- Dynamic typing
- Built-in types and tools
- Library utilities
- Third party utilities (e.g. Numeric, NumPy, SciPy)
- Automatic memory management
 It's portable
- Python runs virtually every major platform used today
- As long as you have a compatible Python interpreter installed,
Python programs will run in exactly the same manner,
irrespective of platform.

 Simple and Readable Syntax:Python emphasizes
code readability and simplicity. Its syntax is
clean and easy to understand, making it an
excellent choice for beginners .
 Interpreted Language:Python is an interpreted
language, meaning code is executed line-by-line
by the Python interpreter. This allows for quick
testing, debugging, and prototyping without the
need for compiling, making development faster
and more flexible

 Dynamically Typed: Python is dynamically typed,
meaning you don't need to declare variable types
explicitly.
 x = 10 # x is an integer
 y = "Hello" # y is a string
 Extensive Standard Library
 Python comes with a comprehensive standard library
that includes modules for a wide range of tasks, from
file handling, web development, and data processing
to system operations, network programming, and
more.

 Cross-Platform Compatibility
 Python is cross-platform, meaning it can run on
various operating systems, including Windows,
macOS, and Linux, without requiring
modification.
 Strong Community Support
 Python has a large, active, and supportive
community of developers. This means that a
wealth of resources, including tutorials,
documentation, and forums, are available to help
with problem-solving, learning, and

First program
 print("Hello, World!")
 How it works:
 print() is a built-in function in Python that
outputs the specified message to the console.

Installing Python
 Python is pre-installed on most Unix systems,
including Linux and MAC OS X
 But for in Windows Operating Systems , user can
download from the https://www.python.org/downloads/
- from the above link download latest version of
python IDE and install, recent version is 3.4.1 but
most of them uses version 2.7.7 only

 After installing the
Python Ver#2.7.7, go to
start menu then click on
python 2.7 in that one
you can select python
(command line) it is
prompt with >>>

Who uses python today…
 Python is being applied in real revenue-generating products
by real companies. For instance:
 Google makes extensive use of Python in its web search
system, and employs Python’s creator.
 Intel, Cisco, Hewlett-Packard, Seagate, Qualcomm, and IBM
use Python for hardware testing.
 ESRI uses Python as an end-user customization tool for its
popular GIS mapping products.
 The YouTube video sharing service is largely written in
Python

What can I do with Python…?
 System programming
 Graphical User Interface Programming
 Internet Scripting
 Component Integration
 Database Programming
 Gaming, Images, XML , Robot and more

Enough to understand the code
 Indentation matters to code meaning
- Block structure indicated by indentation
 First assignment to a variable creates it
- Variable types don’t need to be declared.
- Python figures out the variable types on its own.
 Assignment is = and comparison is ==
 For numbers + - * / % are as expected
- Special use of + for string concatenation and % for string
formatting (as in C’s printf)
 Logical operators are words (and, or, not) not symbols
 The basic printing command is print

Python Code Execution
 Python’s traditional runtime execution model: source code you
type is translated to byte code, which is then run by the Python
Virtual Machine. Your code is automatically compiled, but then
it is interpreted.
Source code extension is .py
Byte code extension is .pyc (compiled python code)

Running Python
Once you're inside the Python interpreter, type in commands at will.
• Examples:
>>> print 'Hello world'
Hello world
# Relevant output is displayed on subsequent lines without the >>>
symbol
>>> x = [0,1,2]
# Quantities stored in memory are not displayed by default
>>> x
# If a quantity is stored in memory, typing its name will display it
[0,1,2]
>>> 2+3
5

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