python training

1
Python Concept
2
Table of Content

• History
• Overview
• Language features
• Why Python?
• Basic Syntax
• Data Types
• Types of Operator
• Multithreaded Programming
• Tuples
• Conculsion

3
History

• Python is a general-purpose interpreted,
  interactive, object-oriented, and high-level
  programming language.
• It was created by Guido van Rossum during 1985-
  1990. Like Perl, Python source code is also
  available under the GNU General Public License
  (GPL).
• This tutorial gives enough understanding on
  Python programming language.

4
Overview

• Python is Interpreted
• Python is Interactive 
• Python is Object-Oriented 
• Python is a Beginner's Language

5
Language features

• Indentation instead of braces
• Several sequence types
• (i) Strings made of characters,
  immutable
• (ii) Lists made of anything,
  mutable
• (iii) Tuples () made of anything,
  immutable
• Powerful subscripting (slicing)
• Functions are independent entities (not all
  functions are methods)
• Exceptions as in Java
• Simple object system Iterators (like Java) and
  generators

6
Why Python?

• Good example of scripting language
• Pythonic style is very concise
• Powerful but unobtrusive object system
• ?Every value is an object
• Powerful collection and iteration abstractions
  
• ?Dynamic typing makes generics easy

7
Which Python?

• Python 2.7
• Current version on Eniac, so well use it
• Last stable release before version 3
• Implements some of the new features in version 3,
  but fully backwards compatible
• Python 3
• Released a few years ago
• Many changes (including incompatible changes)
• Much cleaner language in many ways
• Strings use Unicode, not ASCII

8
Basic Syntax

• The Python language has many similarities to
  Perl, C, and Java. However, there are some
  definite differences between the languages.
• Syntax
• python
• Python 2.4.3 (1, Nov 11 2010,
  133443)
• GCC 4.1.2 20080704 (Red Hat
  4.1.2-48) on linux2
• Type "help", "copyright",
  "credits" or "license" for more information.
• gtgtgt

9
Data Types

• Python has various standard data types that are
  used to define the operations possible on them
  and the storage method for each of them.
• Python has five standard data types -
• ? Numbers
• ?String
• ? List
• ? Tuple
• ? Dictionary

10
Types of Operator

• Python language supports the following types of
  operators.
• Arithmetic Operators
• Comparison (Relational) Operators
• Assignment Operators
• Logical Operators
• Bitwise Operators
• Membership Operators
• Identity Operators

11
Multithreaded Programming

• Running several threads is similar to running
  several different programs concurrently, but with
  the following benefits -
• ?Multiple threads within a process
  share the same data space with the main thread
  and can therefore share information or
  communicate with each other more easily than if
  they were separate processes.
• ?Threads sometimes called light-weight
  processes and they do not require much memory
  overhead they are cheaper than processes.

12
Tuples

• A tuple is a sequence of immutable Python
  objects. Tuples are sequences, just like lists.
• The differences between tuples and lists are, the
  tuples cannot be changed unlike lists and tuples
  use parentheses, whereas lists use square
  brackets.
• Creating a tuple is as simple as putting
  different comma-separated values.
• Optionally you can put these comma-separated
  values between parentheses also.

13
Conculsion

• Since then, Python has emerged as one of the top
  four or five most widely used programming
  languages in the world.
• As it has grown in popularity, its focus on code
  quality and readability, and their related impact
  on developer productivity, seems to have become
  the more dominant factor behind Python's success.
• Python training in Chennai

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