By Eugene Ciurana
This booklet is set how you can layout, construct, install, and deal with Google App Engine purposes efficiently.
Large scale, excessive availability software improvement was once a gloomy artwork till the
release of Google App Engine. It concerned balancing (and occasionally pitting) the
programmers’ talents opposed to the appliance requisites and the underlying
infrastructure. Google App Engine frees us, the builders, from such a lot concerns
about the infrastructure in order that we will specialize in coding and offering useful
software. It empowers us to advance advanced purposes with an easy and
elegant API, utilizing powerful programming instruments like Python, and leveraging the
sophisticated info garage, looking out and caching applied sciences that helped
Google to be triumphant. this is often cloud computing made effortless and it permits us to
create excessive availability software program as a provider with no over the top overhead or
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Extra info for Developing with Google App Engine (Firstpress)
Listing 2-3 shows a poor man’s Developing with Google App Engine 41 template built into the main Python listing, logically separated from the main program’s business logic but still requiring mixing Python and string processing to generate the program’s output. This was OK for a simple example but isn’t acceptable for a more complex application. Templates are used for separating the presentation aspects of the application from its business logic. The template engine combines data provided by the application with one or more templates to produce a coherent view of the data, as shown in Figure 4-1.
Ico The upload: directive is used for specifying which files must be uploaded to App Engine during an update, because they are uploaded and handled Developing with Google App Engine 53 separately from the application and data files. Defining only the static_files: directive without upload: results in a runtime error when trying to run the application. ico" type="image/x-icon" /> The icon will be available from the application’s home directory whenever any of its pages are loaded, as shown in Figure 4-6.
Like with any other static file, first define the url: expression in a request for finding the file, and then place the CSS files in the appropriate directory off the application’s root. Figure 4-7 shows that the page now uses a different font. Figure 4-7. CSS applied to the BookmarksBin sample page The foundations of the interactive user interface have been laid out for the navigation bar. css" /> Remember to include the leading slash (/) for the static directory name, or the file won’t resolve correctly.
Developing with Google App Engine (Firstpress) by Eugene Ciurana