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The other major use of _ _new_ _() is when defining metaclassesThis is described at the end of this chapter Once created, instances are managed by reference counting If the reference count reaches zero, the instance is immediately destroyedWhen the instance is about to be destroyed, the interpreter first looks for a _ _del_ _() method associated with the object and calls it In practice, it s rarely necessary for a class to define a _ _del_ _() methodThe only exception is when the destruction of an object requires a cleanup action such as closing a file, shutting down a network connection, or releasing other system resources Even in these cases, it s dangerous to rely on _ _del_ _() for a clean shutdown because there s no guarantee that this method will be called when the interpreter exits A better approach may be to define a method such as close() that a program can use to explicitly perform a shutdown Occasionally, a program will use the del statement to delete a reference to an object If this causes the reference count of the object to reach zero, the _ _del_ _() method is called However, in general, the del statement doesn t directly call _ _del_ _() A subtle danger involving object destruction is that instances for which _ _del_ _() is defined cannot be collected by Python s cyclic garbage collector (which is a strong reason not to define _ _del_ _ unless you need to) Programmers coming from languages without automatic garbage collection (eg, C++) should take care not to adopt a programming style where _ _del_ _() is unnecessarily defined Although it is rare to break the garbage collector by defining _ _del_ _(), there are certain types of programming patterns, especially those involving parent-child relationships or graphs, where this.

can be a problem For example, suppose you had an object that was implementing a variant of the Observer Pattern

The code for unfollow! is straightforward: just find the relationship by followed id and destroy it (Listing 1215)11

class Account(object): def _ _init_ _(self,name,balance): selfname = name selfbalance = balance selfobservers = set() def _ _del_ _(self): for ob in selfobservers: obclose() del selfobservers def register(self,observer): selfobserversadd(observer) def unregister(self,observer): selfobserversremove(observer) def notify(self): for ob in selfobservers: obupdate() def withdraw(self,amt): selfbalance -= amt selfnotify() class AccountObserver(object): def _ _init_ _(self, theaccount): selftheaccount = theaccount theaccountregister(self) def _ _del_ _(self): selftheaccountunregister(self) del selftheaccount def update(self): print("Balance is %02f" % selftheaccountbalance) def close(self): print("Account no longer in use") # Example setup a = Account('Dave',100000) a_ob = AccountObserver(a)

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In this code, the Account class allows a set of AccountObserver objects to monitor an Account instance by receiving an update whenever the balance changesTo do this, each Account keeps a set of the observers and each AccountObserver keeps a reference back to the account Each class has defined _ _del_ _() in an attempt to provide some sort of cleanup (such as unregistering and so on) However, it just doesn t work Instead, the classes have created a reference cycle in which the reference count never drops to 0 and there is no cleanup Not only that, the garbage collector (the gc module) won t even clean it up, resulting in a permanent memory leak One way to fix the problem shown in this example is for one of the classes to create a weak reference to the other using the weakref module A weak reference is a way of creating a reference to an object without increasing its reference countTo work with a weak reference, you have to add an extra bit of functionality to check whether the object being referred to still exists Here is an example of a modified observer class:

import weakref class AccountObserver(object): def _ _init_ _(self, theaccount): selfaccountref = weakrefref(theaccount) theaccountregister(self)

class User < ActiveRecord::Base def following (followed) relationshipsfind_by_followed_id(followed) end def follow!(followed) relationshipscreate!(:followed_id => followedid) end def unfollow!(followed) relationshipsfind_by_followed_id(followed)destroy end end

def _ _del_ _(self): acc = selfaccountref() # Get account if acc: # Unregister if still exists accunregister(self) def update(self): print("Balance is %02f" % selfaccountref()balance) def close(self): print("Account no longer in use") # Example setup a = Account('Dave',100000) a_ob = AccountObserver(a)

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