Python222222222222222222222222222(2).ppt

PYTHON
 Mitch Martin
 Josh Amick
 Abdulla Al-nuaimi
 Brad Gunnells

Points of Interest
 Overview
 Language evolution
 Language concepts
 Examples of usage
 Comparison and Popularity
 Impact and Assessment

What is Python?
 Interpreted, Interactive and Object-oriented
 Remarkable power with clear syntax
 Interfaces to system calls and libraries
 Extensible in C or C++
 Portable (Unix, Mac, MS-DOS, Windows, OS/2)
 Incorporates: modules, exceptions, dynamic
typing, very high level dynamic data types, and
classes

Python name?
 Looking for name that was short,
unique, and slightly mysterious
 Guido van Rossum was reading
“Monty Python ’s Flying Circus” at the
time
 Decided to call new language
PYTHON

History
 Created by Guido van Rossum
 Started during Christmas holidays
1989
 Spent year working on own time
 Success using it in Amoeba Project
 Prompted him to keep improving it

Problem Domain
 Guido van Rossum needed a scripting
language like ABC that could access
Amoeba system calls.
 He also realized it would need to be
extensible so it wouldn’t be specific to
the Amoeba Project.

Problem Domain cont.
 ABC
 Use of indentation for statement
grouping
 Very-high-level data types
 Implementation very different
 Lack of extensibility led to:

 Had experience with Modula-2+
 Talked to designers of Modula-3
 Read Modula-3 report
 Origin of syntax and semantics
used for exception handling
Problem Domain cont.

Language Concepts
 Dynamically Typed
 No need for type declarations before use
 Clean and Concise Syntax
 No Braces or semicolons
 Indentations define blocks ->
 No Switch Statement

Use if...elif...elif...else
 One Constructor per Class
Example:
if x == y:
...block
elif x > y:
...block
else:
...block

Sample Code
class Student():
def __init__(self, argStudentName, argGPA = 0, argClass = "freshman"):
self.StudentName = argStudentName
self.GPA = argGPA
self.Class = argClass
...

Python Compared to Other
Languages
 Scripting language
 High-Level
language
 Syntax

Emphasizes
readability

Indentation

If, while, for
http://en.wikipedia.org/wiki/
Image:Python_add5_syntax.png

Comparison con't.
 Free under GNU GPL
 Object oriented
 Very similar to Perl, Ruby, Scheme, Smalltalk &
Tcl
 Can work with other languages such as Java and
C/C++
 Types – Variables
 Duck – Latent typing
 Does not enforce static typing
 Strongly typed

Python Popularity
 Relatively young
language – Created
in early 1990's
 Tens of thousands
of users
 NASA, AstraZeneca
and Honeywell,
Industrial Light and
Magic, Google,
Yahoo
http://www.python.org/pics/pythonHi.gif

Usage
 It can handle small and big projects.
 Actively used in industry and academia.
 It utilizes some of the largest projects
Such as:
 Zope: application server
 BitTorrent: file sharing
 Google: used extensively

Future development
 Python 3.0 (Python 3000)
 New features:

moving map, filter and reduce out of the built-in namespace.
 adding support for optional type declarations.

unifying the str/unicode types, and introducing a separate
mutable bytes type.

converting built-ins to returning iterators (instead of lists),
where appropriate.

removing backward-compatibility features like classic
classes, classic division, string exceptions, and implicit
relative imports.

Questions
Questions are guaranteed in life;
Answers aren’t
????

Bibliography
 http://www.python.org/doc/faq/general/
 http://en.wikipedia.org/wiki/Python_
programming_language
 http://www.ibiblio.org/g2swap/
byteofpython/read/if-statement.html

Python222222222222222222222222222(2).ppt

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