Python222222222222222222222222222(2).ppt

eee

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

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

3. 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

4. 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

5. 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

6. 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.

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

8. 
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.

9. 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

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

11. Sample Code

12. Sample Code (cont.)

13. 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

14. 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

15. 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

16. 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

17. 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.

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

19. 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