OOP and Scripting in Python

Transcription

1 DIEE - Università degli Studi di Cagliari OOP and Scripting in Python Introduction Giuliano Armano DIEE Univ. di Cagliari

2 Python Roots... Object Oriented Programming (C++, Modula-3, ABC, Icon) Scripting Languages (Perl, Tcl) Python Functional Programming (Scheme) Author: Guido Van Rossum, 1990

3 Timeline 1989/1990 First code 1991 First Release 1992 Mailing list 1992 Python for MS-DOS comp.lang.python Python newsgroup 1995 Website

4 Timeline Python 2.x.x 1998 Z Object Publishing Environment, aka Zope Python Official GPL-compatibility Release 2.3.X Release 2.4.X Release 2.5.X Releases 2.6.X Release 2.7.X

5 Timeline Python Release Release 3.1.x 2011 Release 3.2.x 2012 Release 3.3.x...

6 Ongoing Work Python is the latest advancement in the Python 2 series Python is the latest of the Python 3000 series (backward-incompatible) Notes Python 2.7 will be the last backward-compatible transitional release As such, many features are being backported from Python 3.x to 2.6 and 2.7 Thus, it makes sense to release both versions at the same time

7 Python is an easy to learn, powerful programming language. It has efficient high-level data structures and a simple but effective approach to object-oriented programming. Python's elegant syntax and dynamic typing, together with its interpreted nature, make it an ideal language for scripting and rapid application development in many areas on most platforms.

8 Bibliography Python in a Nutshell: Martelli (O Reilly, 2003) Python Cookbook: Martelli, Ascher (O Reilly, 2002) Programming Python, Lutz (O Reilly 2001, 2 nd ed.) Learn to Program Using Python: Gauld (Addison- Wesley, 2000) Learning Python: Lutz, Ascher (O Reilly, 1998)

9 Some Links Python.org Python docs Cetus Links Python eggs Gaudi Project

10 The Zen of Python... Beautiful is better than ugly. Explicit is better than implicit. Simple is better than complex. Complex is better than complicated. Flat is better than nested. Sparse is better than dense. Readability counts. Special cases aren't special enough to break the rules. Although practicality beats purity.

11 The Zen of Python... Errors should never pass silently. Unless explicitly silenced. In the face of ambiguity, refuse the temptation to guess. There should be one and preferably only one obvious way to do it. Although that way may not be obvious at first unless you're Dutch.

12 The Zen of Python Now is better than never. Although never is often better than *right* now. If the implementation is hard to explain, it's a bad idea. If the implementation is easy to explain, it may be a good idea. Namespaces are one honking great idea -- let's do more of those!

13 The Python Interpreter... Yes, Python is interpreted! Python (r264:75706, Dec , 18:45:15) [GCC 4.4.1] on linux2 Type "copyright", "credits" or "license()" for more information. IDLE ==== No Subprocess ==== >>> >>> print "Hello, world" Hello, world >>>

14 Summary Part 0 - Introducing Python (yes, this doc) Part 1 - Python Basic Features Part 2 - Python OOP Features Part 3 - Python Advanced Features Part 4 - Python Extra Modules and Applications

15 Part 1 - Python Basic Features A01-basics-00 A01-basics-01-syntax A01-basics-02-data-types A01-basics-03-control-structures A01-basics-04-functions A01-basics-05-Input-Output A01-basics-06-exceptions A01-basics-07-modules

16 Part 2 - Python OOP Features A02-OOP-00-intro A02-OOP-01-detailed

17 Part 3 - Python Advanced Features A03-advanced-01-fun-progr A03-advanced-02-reflection

18 Part 4 - Python Adv. Features (more) A04-gui-01-Tkinter A05-web-01-pylons A05-web-02-CGI A06-xtra-01-database A06-xtra-02-lang-interface A06-xtra-03-scientific-computing