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Classes and Object-Oriented Programming
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lasses are the mechanism used to create new kinds of objectsThis chapter covers the details of classes, but is not intended to be an in-depth reference on object-oriented programming and design It s assumed that the reader has some prior experience with data structures and object-oriented programming in other languages such as C or Java ( 3, Types and Objects, contains additional information about the terminology and internal implementation of objects)
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The class Statement
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A class defines a set of attributes that are associated with, and shared by, a collection of objects known as instances A class is most commonly a collection of functions (known as methods), variables (which are known as class variables), and computed attributes (which are known as properties) A class is defined using the class statementThe body of a class contains a series of statements that execute during class definition Here s an example:
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class Account(object): num_accounts = 0 def _ _init_ _(self,name,balance): selfname = name selfbalance = balance Accountnum_accounts += 1 def _ _del_ _(self): Accountnum_accounts -= 1 def deposit(self,amt): selfbalance = selfbalance + amt def withdraw(self,amt): selfbalance = selfbalance - amt def inquiry(self): return selfbalance
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The values created during the execution of the class body are placed into a class object that serves as a namespace much like a module For example, the members of the Account class are accessed as follows:
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Accountnum_accounts Account_ _init_ _ Account_ _del_ _ Accountdeposit Accountwithdraw Accountinquiry
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7 Classes and Object-Oriented Programming
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It s important to note that a class statement by itself doesn t create any instances of the class (for example, no accounts are actually created in the preceding example) Rather, a class merely sets up the attributes that will be common to all the instances that will be created later In this sense, you might think of it as a blueprint The functions defined inside a class are known as instance methods An instance method is a function that operates on an instance of the class, which is passed as the first argument By convention, this argument is called self, although any legal identifier name can be used In the preceding example, deposit(), withdraw(), and inquiry() are examples of instance methods Class variables such as num_accounts are values that are shared among all instances of a class (that is, they re not individually assigned to each instance) In this case, it s a variable that s keeping track of how many Account instances are in existence
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Class Instances
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Instances of a class are created by calling a class object as a functionThis creates a new instance that is then passed to the _ _init_ _() method of the classThe arguments to _ _init_ _() consist of the newly created instance self along with the arguments supplied when calling the class object For example:
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# Create a few accounts a = Account("Guido", 100000) b = Account("Bill", 1000) # Invokes Account_ _init_ _(a,"Guido",100000)
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Inside _ _init_ _(), attributes are saved in the instance by assigning to self For example, selfname = name is saving a name attribute in the instance Once the newly created instance has been returned to the user, these attributes as well as attributes of the class are accessed using the dot () operator as follows:
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adeposit(10000) bwithdraw(5000) name = aname # Calls Accountdeposit(a,10000) # Calls Accountwithdraw(b,5000) # Get account name
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The dot () operator is responsible for attribute bindingWhen you access an attribute, the resulting value may come from several different places For example, aname in the previous example returns the name attribute of the instance a However, adeposit returns the deposit attribute (a method) of the Account classWhen you access an attribute, the instance is checked first and if nothing is known, the search moves to the instance s class insteadThis is the underlying mechanism by which a class shares its attributes with all of its instances
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