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In all the previous chapters we used objects extensively, but our style of programming has been strictly procedural Python is a multiparadigm language it allows us to program in procedural, object-oriented, and functional style, or in any mixture of styles, since it does not force us to program in any one particular way It is perfectly possible to write any program in procedural style, and for very small programs (up to, say, 500 lines), doing so is rarely a problem But for most programs, and especially for medium-size and large programs, object-oriented programming offers many advantages This chapter covers all the fundamental concepts and techniques for doing object-oriented programming in Python The rst section is especially for those who are less experienced and for those coming from a procedural programming background (such as C or Fortran) The section starts by looking at some of the problems that can arise with procedural programming that object-oriented programming can solve Then it brie y describes Python s approach to objectoriented programming and explains the relevant terminology After that, the chapter s two main sections begin The second section covers the creation of custom data types that hold single items (although the items themselves may have many attributes), and the third section covers the creation of custom collection data types that can hold any number of objects of any types These sections cover most aspects of object-oriented programming in Python, although we defer some more advanced material to 8

accessed through a object of raw type (note that access to a static member through an instance is considered bad style and is to be discouraged) The member myNumbers is inherited from the NonGeneric (whose erasure is also NonGeneric) and so retains its full parameterized type

shown in Figure 5-5 The application takes a search string entered by a user and issues a query against the directory The results are displayed in a scrollable text box The code demonstrates use of a lter con guration le, the searching functions of the LDAP SDK, and some AWT (Abstract Windows Toolkit) user interface code as well The code is presented here for review, and it will be extended in the next section in our discussion of client-side sorting

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Raw types are closly related to wildcards Both are based on existential types Raw types can be thought of as wildcards whose type rules are deliberately unsound, to accommodate interaction with legacy code Historically, raw types preceded wildcards; they were rst introduced in GJ, and described in the paper Making the future safe for the past: Adding Genericity to the Java Programming Language by Gilad Bracha, Martin Odersky, David Stoutamire, and Philip

import import import import import import javalang*; javaawt*; javaawtevent*; netscapeldap*; netscapeldaputil*; javautil*;

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abstract class RawMembers<T> extends NonGeneric implements Collection<String> { static Collection<NonGeneric> cng = new ArrayList<NonGeneric>();

Figure 148 shows the complete hierarchyblk le, and Figure 149 shows how the hierarchysvg le that the blockspy program produces is rendered The blocks format has essentially two elements: blocks and new row markers Blocks are enclosed in brackets Blocks may be empty, in which case they are used as spacers occupying one cell of a notional grid Blocks may also contain text and optionally a color New row markers are forward slashes and they indicate where a new row should begin In Figure 148 two new row markers are used each time and this is what creates the two blank rows that are visible in Figure 149 The blocks format also allows blocks to be nested inside one another, simply by including blocks and new row markers inside a block s brackets, after the block s text

Wadler, in Proc of the ACM Conf on Object-Oriented Programming, Systems, Languages and Applications, (OOPSLA 98) October 1998

/** * Frame to select filters from a filter file and do searches */ public class FilterSearchDialog extends Frame { /** * Launch a frame to do searches using a filter file * * @param args host, port, authDN, password, base */ public static void main( String[] args ) { if ( (argslength != 4) && (argslength != 6 ) ) { Systemoutprintln( "Usage: java " + "FilterSearchDialog " + "<host> <port> " + "<filterfile> <baseDN> " + "[<authdn> <password>]" ); Systemoutprintln( "Example:" ); Systemoutprintln( " java " + "FilterSearchDialog " + "localhost 389 " + "filterconf \"o=airiuscom\"" ); Systemexit(1); } String host = args[0]; int port = IntegerparseInt( args[1] ); String conf = args[2];

Figure 1410 shows the complete messageboxblk le in which blocks are nested, and Figure 1411 shows how the messageboxsvg le is rendered

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