By Massimo DiPierro
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Extra info for Web2py Enterprise Web Framework, 2nd Edition
Example text
Also, T needs to be easy to locate in the code and has to have a short name. ). ELEMENTS OF STYLE 19 In all other cases we believe we have followed, as much as possible, the Python Style Guide (PEP8). For example all instance objects are lower-case (request, response, session, cache), and all internal classes are capitalized. In all the examples of this book, web2py keywords are shown in bold, while strings and comments are shown in italic. 1 About Python Python is a general-purpose and very high-level programming language.
You can download web2py appliances from the corresponding web site [33]. You can find additional topics discussed on AlterEgo [34], the interactive web2py FAQ. 11 Elements of Style Ref. [35] contains good style practices when programming with Python. You will find that web2py does not always follow these rules. This is not because of omissions or negligence; it is our belief that the users of web2py should follow these rules and we encourage it. We chose not to follow some of those rules when defining web2py helper objects in order to minimize the probability of name conflict with objects defined by the user.
Notice that init takes 3 arguments and add takes one, and yet we call them with 2 and 0 arguments respectively. The first argument represents, 34 THE PYTHON LANGUAGE by convention, the local name used inside the method to refer to the current object. Here we use self to refer to the current object, but we could have used any other name. self plays the same role as *this in C++ or this in Java, but self is not a reserved keyword. This syntax is necessary to avoid ambiguity when declaring nested classes, such as a class that is local to a method inside another class.
