Download e-book for iPad: Hello Web App: Learn How to Build a Web App by Tracy Osborn

By Tracy Osborn

The best way to code net apps and get at the route to development your subsequent facet undertaking, your way of life company, or your startup.

Hello net App is written for non-programmers through a clothier, and may stroll you thru each step you wish prior to launching your internet app dwell to genuine clients. No jargon, utilizing easy and pleasant language.

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A decorator is a way to tell Python to do some extra stuff automatically whenever a function is called. This means you can use a decorator to easily add similar functionality to a whole bunch of methodswithout repeating code. This is particularly useful for "cross-cutting" concerns such as security that would otherwise end up "infecting" all of your classes with a bunch of similar code. In Python, functions are "first-class objects," which means you can pass a function around just like any other object.

4 decorator syntax makes this process even easier: @logging_decorator def fun(x): ... The @logging_decorator is semantically equivalant to fun = logging_decorator(fun). It wraps fun() with a call to logging_decorator, without the need to repeat the name of the original function three times. TurboGears and CherryPy provide several decorators in addition to @expose() that you can use in your controllers to make your life easier. We explore those decorators in depth in Chapter 17. index") def index(): pass Where project_name is the name of your project!

If you're not convinced already, we're not going to force you to change the way you write code. For those who are convinced that writing tests early and often will save time on every change you make later, however, we're going to cover testing right up front. com/mrl/projects/nose/). TestCase objects, doctests, or simple test functions in a module. To run your tests, just type nosetests in the top-level directory of your project. Nose will then look through your project's directories to find whatever tests it can and run them all.

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