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This chapter covered all the fundamentals of Python s support for object-oriented programming We began by showing some of the disadvantages of a purely procedural approach and how these could be avoided by using object orientation We then described some of the most common terminology used in objectoriented programming, including many duplicate terms such as base class and super class We saw how to create simple classes with data attributes and custom methods We also saw how to inherit classes and how to add additional data attributes and additional methods, and how methods can be unimplemented Unimplementing is needed when we inherit a class but want to restrict the methods that our subclass provides, but it should be used with care since it breaks the expectation that a subclass can be used wherever one of its base classes can be used, that is, it breaks polymorphism Custom classes can be seamlessly integrated so that they support the same syntaxes as Python s built-in and library classes This is achieved by implementing special methods We saw how to implement special methods to support comparisons, how to provide representational and string forms, and how to provide conversions to other types such as int and float when it makes sense to do so We also saw how to implement the __hash__() method to make a custom class s instances usable as dictionary keys or as members of a set Data attributes by themselves provide no mechanism for ensuring that they are set to valid values We saw how easy it is to replace data attributes with properties this allows us to create read-only properties, and for writable properties makes it easy to provide validation Most of the classes we create are incomplete since we tend to provide only the methods that we actually need This works ne in Python, but in addition it is possible to create complete custom classes that provide every relevant method We saw how to do this for single valued classes, both by using aggregation and more compactly by using inheritance We also saw how to do this for multivalued (collection) classes Custom collection classes can provide the same facilities as the built-in collection classes, including support for in, len(), iter(), reversed(), and the item access operator ([]).

class Toomany { static void howMany(int k) { switch (k) { case 1:Systemoutprint("one "); case 2:Systemoutprint("too "); case 3:Systemoutprintln("many"); } }

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if ( ldc == null ) { Debugprintln( "DirNodegetChildList: " + "no LDAP connection" ); return new Vector(); } LDAPSearchConstraints cons = ldcgetSearchConstraints(); // Unlimited search results conssetMaxResults( 0 ); LDAPControl[] controls; if ( !getModel()getReferralsEnabled() ) { // If not following referrals, send the // manageDSAIT control, which tells the server // to return referral entries as ordinary // entries controls = new LDAPControl[2]; controls[0] = _manageDSAITControl; } else { controls = new LDAPControl[1]; } // Ask the server to sort the results, by // specifying a sort control String[] sortOrder = { "sn", "givenName", "cn", "ou", "o" }; LDAPSortKey[] keys = new LDAPSortKey[sortOrderlength]; for( int i = 0; i < sortOrderlength; i++ ) { keys[i] = new LDAPSortKey( sortOrder[i] ); } controls[controlslength-1] = new LDAPSortControl( keys, false ); conssetServerControls( controls ); // Search for immediate children LDAPSearchResults result = ldcsearch( dn, ldcSCOPE_ONE, getChildFilter(), _baseAttrs, false, cons ); Debugprintln(9, "DirNodegetChildList: <" + dn + "> searching" ); int found = 0; while ( resulthasMoreElements() ) { try { // Add each entry found to the tree LDAPEntry entry = resultnext();

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If no case matches and there is no default label, then no further action is taken and the switch statement completes normally

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