Python is a high-level, interpreted programming language that emphasizes readability and simplicity,

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

Difference Between Program and scripting language
Program
• 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.
Scripting
• 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.

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

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

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.
 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.

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

A Sample Code
X= 34-23 #A comment.
Y=“Hello” #Another one.
Z=3.45
If z==3.45 or Y==“Hello”:
X=X+1
Y=Y+ “World” #String Concat.
print X
print Y

Python is a high-level, interpreted programming language that emphasizes readability and simplicity,

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Python is a high-level, interpreted programming language that emphasizes readability and simplicity,