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methods, __get__(), __set__(), and __delete__(), is called (and can be used as) a descriptor The built-in property() and classmethod() functions are implemented using descriptors The key to understanding descriptors is that although we create an instance of a descriptor in a class as a class attribute, Python accesses the descriptor through the class s instances To make things clear, let s imagine that we have a class whose instances hold some strings We want to access the strings in the normal way, for example, as a property, but we also want to get an XML-escaped version of the strings whenever we want One simple solution would be that whenever a string is set we immediately create an XML-escaped copy But if we had thousands of strings and only ever read the XML version of a few of them, we would be wasting a lot of processing and memory for nothing So we will create a descriptor that will provide XML-escaped strings on demand without storing them We will start with the beginning of the client (owner) class, that is, the class that uses the descriptor:

The cast operator ( 55, 1516)

LDUP Replication Information Model (draft-ietf-ldup-infomod-00txt)

class Product: __slots__ = ("__name", "__description", "__price") name_as_xml = XmlShadow("name") description_as_xml = XmlShadow("description") def __init__(self, name, description, price): self__name = name selfdescription = description selfprice = price

The string concatenation operator + ( 15181), which, when given a String operand and a reference, will convert the reference to a String by invoking the toString method of the referenced object (using "null" if either the reference or the result of toString is a null reference), and then will produce a newly created String that is the concatenation of the two strings

This document describes the information model and schema elements that support LDAP replication services that conform to draft-ietf-ldup-model-01txt

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The only code we have not shown are the properties; the name is a read-only property and the description and price are readable/writable properties, all set up in the usual way (All the code is in the XmlShadowpy le) We have used the __slots__ variable to ensure that the class has no __dict__ and can store only the three speci ed private attributes; this is not related to or necessary for our use of descriptors The name_as_xml and description_as_xml class attributes are set to be instances of the XmlShadow descriptor Although no Product object has a name_as_xml attribute or a description_as_xml attribute, thanks to the descriptor we can write code like this (here quoting from the module s doctests):

The instanceof operator ( 15202)

>>> product = Product("Chisel <3cm>", "Chisel & cap", 4525) >>> productname, productname_as_xml, productdescription_as_xml ('Chisel <3cm>', 'Chisel <3cm>', 'Chisel & cap')

LDUP Update Reconciliation Procedures (draft-ietf-ldup-urp-02txt)

The reference equality operators == and != ( 15213) The conditional operator : ( 1525)

This works because when we try to access, for example, the name_as_xml attribute, Python nds that the Product class has a descriptor with that name,

There may be many references to the same object Most objects have state, stored in the elds of objects that are instances of classes or in the variables that are the components of an array object If two variables contain references to the same object, the state of the object can be modi ed using one variable s reference to the object, and then the altered state can be observed through the reference in the other variable

This document describes the procedures used by directory servers to reconcile updates performed by autonomously operating directory servers in a distributed, replicated directory service These procedures are a joint development of the IETF and ITU-T for use in LDAP directory replication (LDUP), and the X500 Directory Multi-master Replication Protocol

and so uses the descriptor to get the attribute s value Here s the complete code for the XmlShadow descriptor class:

The example program:

Authentication and Security Authentication Methods for LDAP (draft-ietf-ldapext-authmeth-04txt)

class XmlShadow: def __init__(self, attribute_name): selfattribute_name = attribute_name def __get__(self, instance, owner=None): return xmlsaxsaxutilsescape( getattr(instance, selfattribute_name))

class Value { int val; } class Test { public static void main(String[] args) { int i1 = 3; int i2 = i1; i2 = 4; Systemoutprint("i1==" + i1); Systemoutprintln(" but i2==" + i2); Value v1 = new Value(); v1val = 5; Value v2 = v1; v2val = 6; Systemoutprint("v1val==" + v1val); Systemoutprintln(" and v2val==" + v2val); } }

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