By Massimo DiPierro
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Additional resources for Web2py Enterprise Web Framework, 2nd Edition
Sample text
Every web2py application consists of certain files, most of which fall into one of five categories: • models: describe the data representation. • controllers: describe the application logic and workflow. • views: describe the data presentation. • languages: describe how to translate the application presentation to other languages. • modules: Python modules that belong to the application. • static files: static images, CSS files [39, 40, 41], JavaScript files [42, 43], etc. Everything is neatly organized following the Model-View-Controller design pattern.
App/Contents/MacOS/web2py -S welcome On a Linux or other Unix box, chances are that you have Python already installed. 5 already installed, you will have to download and install it before running web2py. The -S welcome command line option instructs web2py to run the interactive shell as if the commands were executed in a controller for the welcome application, the web2py scaffolding application. This exposes almost all web2py classes, objects and functions to you. This is the only difference between the web2py interactive command line and the normal Python command line.
In In Python, you can loop over iterable objects: 1 2 3 4 5 6 7 >>> a = [0, 1, 'hello', 'python'] >>> for i in a: print i 0 1 hello python One common shortcut is xrange, which generates an iterable range without storing the entire list of elements. 1 2 3 4 5 6 >>> for i in xrange(0, 4): print i 0 1 2 4 This is equivalent to the C/C++/C#/Java syntax: 1 for(int i=0; i<4; i=i+1) { print(i); } Another useful command is enumerate, which counts while looping: 1 2 3 4 5 6 7 >>> a = [0, 1, 'hello', 'python'] >>> for i, j in enumerate(a): print i, j 0 0 1 1 2 hello 3 python WHILE 29 There is also a keyword range(a, b, c) that returns a list of integers starting with the value a, incrementing by c, and ending with the last value smaller than b, a defaults to 0 and c defaults to 1.