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Python

Python. Brandon Jeffcoat Dashaun West. “Why settle for snake oil when you can have the whole snake?” -- From Usenet posting by Mark Jackson, June 1998. History of Python. Created in 1990 by Guido van Rossum Named after Monty Python First public release in 1991

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Python

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  1. Python Brandon Jeffcoat Dashaun West “Why settle for snake oil when you can have the whole snake?” -- From Usenet posting by Mark Jackson, June 1998

  2. History of Python • Created in 1990 by Guido van Rossum • Named after Monty Python • First public release in 1991 • comp.lang.python founded in 1994 • Open source from the start

  3. Python Overview • Scripting Language • Object-Oriented • Portable • Powerful • Easy to learn and use • Mixes good features from Java, Perl and Scheme

  4. Major Uses of Python • System Utilities • GUIs (Tkinter, gtk, Qt, Windows) • Internet Scripting • Embedded Scripting • Database Programming • Artificial Intelligence • Image Processing

  5. Language Features • Object-Oriented • Interpreted • Interactive • Dynamic • Functional • Highly readable

  6. Comparsions Java • Typically 3-5 times shorter than equivalent Java programs • Run-time works harder than Java’s • Components can be developed in Java and combined to form applications in Python • Python can be used to prototype components into Java implementation

  7. Comparsions, cont’d Perl • Come from similar backgrounds • Python is more applicable than Perl • Perl emphasizes support for common application-oriented tasks • Python emphasizes support for common programming methodologies

  8. Comparsions, cont’d C++ • Differences are similar to Java’s • Often 5-10 times shorter than equivalent C++ code • Python shines as a glue language; used to combine components written in C++

  9. Comparsions, cont’d Common Lisp and Scheme • Similar in dynamic semantics, different in approach to syntax • Common Lisp is big and Scheme world is fragmented between many incompatible versions • Python has a single, free compact implementation

  10. Samples • System Utility • Functional Programming • Object Oriented networking

  11. Samples • The Weather Server product family consists of a number of products for production and display of forecast data, satellite images, and radar data. • Secret Labs AB currently offers the following products: • Weather Production Server, for mission-critical processing and distribution of weather data. Servers based on this technology has been used in production since 1995. • Weather Media Server, for production and distribution of end-user products, for use via web browsers or custom weather workstations.

  12. Samples • Weather Media Generator, for production of end-user products in existing distribution environments. • Weather Visualisation Client is a toolbox for advanced visualisation of meteorological data. • Weather Workstation, for interactive display and analysis of satellite and radar images

  13. Sample Code • Here's a simple function written in Python, which inverts a table (represented as a Python dictionary): def invert(table): index = {} # empty dictionary for key in table.keys(): value = table[key] if not index.has_key(value): index[value] = [] # empty list index[value].append(key) return index Comments are introduced by a # character

  14. References • Python homepage: http://www.python.org/ • Programming Python and Learning Python: http://python.oreilly.com/ • Weather Server http://www.pythonware.com/products/index.htm

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