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By default, all attributes and methods of a class are public This means that they are all accessible without any restrictions It also implies that everything defined in a base class is inherited and accessible within a derived classThis behavior is often undesirable in object-oriented applications because it exposes the internal implementation of an object and can lead to namespace conflicts between objects defined in a derived class and those defined in a base class To fix this problem, all names in a class that start with a double underscore, such as _ _Foo, are automatically mangled to form a new name of the form _Classname_ _Foo This effectively provides a way for a class to have private attributes and methods because private names used in a derived class won t collide with the same private names used in a base class Here s an example:

class A(object): def _ _init_ _(self): self_ _X = 3 def _ _spam(self): pass def bar(self): self_ _spam()

<configuration> <connectionStrings> <add name="LocalSqlServer" connectionString="data source=\SQLEXPRESS;Integrated Security=SSPI;AttachDBFilename=|DataDirectory|aspnetdbmdf;User Instance=true" providerName="SystemDataSqlClient" /> </connectionStrings> <systemweb> <membership> <providers> <add name="AspNetSqlMembershipProvider" type="SystemWebSecuritySqlMembershipProvider, SystemWeb, Version=2000, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" connectionStringName="LocalSqlServer" enablePasswordRetrieval="false" enablePasswordReset="true" requiresQuestionAndAnswer="true" applicationName="/" requiresUniqueEmail="false" passwordFormat="Hashed" maxInvalidPasswordAttempts="5" minRequiredPasswordLength="7" minRequiredNonalphanumericCharacters="1" passwordAttemptWindow="10" passwordStrengthRegularExpression="" /> </providers> </membership> <profile> <providers> <add name="AspNetSqlProfileProvider" connectionStringName="LocalSqlServer" applicationName="/" type="SystemWebProfileSqlProfileProvider, SystemWeb, Version=2000, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" /> </providers> </profile> <roleManager>

relationshipscreate!()

# Mangled to self_A_ _X # Mangled to _A_ _spam()

# Only calls A_ _spam()

# Mangled to self_B_ _X # Mangled to _B_ _spam()

selfrelationshipscreate!()

<providers> <add name="AspNetSqlRoleProvider" connectionStringName="LocalSqlServer" applicationName="/" type="SystemWebSecuritySqlRoleProvider, SystemWeb, Version=2000, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" /> <add name="AspNetWindowsTokenRoleProvider" applicationName="/" type="SystemWebSecurityWindowsTokenRoleProvider,SystemWeb, Version=2000, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" /> </providers> </roleManager> </systemweb> </configuration>

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Although this scheme provides the illusion of data hiding, there s no strict mechanism in place to actually prevent access to the private attributes of a class In particular, if the name of the class and corresponding private attribute are known, they can be accessed using the mangled name A class can make these attributes less visible by redefining the _ _dir_ _() method, which supplies the list of names returned by the dir() function that s used to inspect objects Although this name mangling might look like an extra processing step, the mangling process actually only occurs once at the time a class is defined It does not occur during execution of the methods, nor does it add extra overhead to program execution Also, be aware that name mangling does not occur in functions such as getattr(), hasattr(), setattr(), or delattr() where the attribute name is specified as a string For these functions, you need to explicitly use the mangled name such as _Classname_ _name to access the attribute It is recommended that private attributes be used when defining mutable attributes via properties By doing so, you will encourage users to use the property name rather than accessing the underlying instance data directly (which is probably not what you intended if you wrapped it with a property to begin with) An example of this appeared in the previous section Giving a method a private name is a technique that a superclass can use to prevent a derived class from redefining and changing the implementation of a method For example, the Abar() method in the example only calls A_ _spam(), regardless of the type of self or the presence of a different _ _spam() method in a derived class Finally, don t confuse the naming of private class attributes with the naming of private definitions in a module A common mistake is to define a class where a single leading underscore is used on attribute names in an effort to hide their values (eg, _name) In modules, this naming convention prevents names from being exported by the from module import * statement However, in classes, this naming convention does not hide the attribute nor does it prevent name clashes that arise if someone inherits from the class and defines a new attribute or method with the same name.

When a class is defined, the resulting class is a factory for creating new instances For example:

Whether to include the explicit self is largely a matter of taste Of course, users should be able to unfollow other users as well as follow them, which leads to the somewhat predictable unfollow! method, as shown in Listing 121410

<connectionStrings> <remove name="LocalSqlServer"/> <add name="LocalSqlServer" connectionString="DataSource=localhost; Initial Catalog=aspnetdb;Integrated Security=True" providerName="SystemDataSqlClient"/> </connectionStrings>

class Circle(object): def _ _init_ _(self,radius): selfradius = radius # Create some Circle instances c = Circle(40) d = Circle(50)

The creation of an instance is carried out in two steps using the special method _ _new_ _(), which creates a new instance, and _ _init_ _(), which initializes it For example, the operation c = Circle(40) performs these steps:

c = Circle_ _new_ _(Circle, 40) if isinstance(c,Circle): Circle_ _init_ _(c,40)

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