Python: Multiple Inheritance

Dec 29, 2016Download as pptx, pdf

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Multiple inheritance allows a subclass to inherit from multiple parent classes, combining their functionality. While simple in concept, it can be tricky to implement clearly. The simplest form is a mixin, where a class is designed to be inherited from to share methods and attributes without becoming a unique entity itself. The example demonstrates a MailSender mixin class that a EmailableContact class inherits from along with a Contact class, allowing send_mail functionality to be reused across classes.

Multiple Inheritance
• A subclass can inherit from multiple superclasses, and have the
functionality of all of those superclasses available to it.
• This is called Multiple Inheritance.
• It sounds simple, and it is simple, but it is considered a very
tricky to implement in a clear way.

Most read

Multiple Inheritance
• Let’s say we want to add functionality to our Contact class,
to allow us to send an e-mail to self.email.
• Sending an e-mail is a sufficiently general task that many other
classes might use it also.
• Let’s look at the MIXIN class for e-mailing:

Multiple Inheritance
class MailSender:
def send_mail(self, message)
print(“Sending mail to ” + self.email)
# e-mail logic here
# END send_mail.
# END class.

Multiple Inheritance
• So now we can create a new class that uses both Contact
and our new class MailSender
class EmailableContact(Contact,MailSender):
# Do stuff
# END class.

Multiple Inheritance
• So defining a class that uses multiple inheritance works a lot
like calling a method with a number of parameters. We can
test the new program with the following:
>>>e = EmailableContact(“John Smith”, “jsmith@Company.com”)
>>> e.send_mail(“Hello, test email”)
Sending mail to jsmith@Company.com

Multiple Inheritance
• The simplest and most useful form of multiple inheritance is
called a mixin.
• A MIXIN is a class that is specifically created to be a superclass
that other classes will inherit methods and attributes from.
• Let’s look at an example:

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Python: Multiple Inheritance

1. Multiple Inheritance Damian Gordon

2. Multiple Inheritance • A subclass can inherit from multiple superclasses, and have the functionality of all of those superclasses available to it. • This is called Multiple Inheritance. • It sounds simple, and it is simple, but it is considered a very tricky to implement in a clear way.

3. Multiple Inheritance • The simplest and most useful form of multiple inheritance is called a mixin. • A MIXIN is a class that is specifically created to be a superclass that other classes will inherit methods and attributes from. • Let’s look at an example:

4. Multiple Inheritance • Let’s say we want to add functionality to our Contact class, to allow us to send an e-mail to self.email. • Sending an e-mail is a sufficiently general task that many other classes might use it also. • Let’s look at the MIXIN class for e-mailing:

5. Multiple Inheritance class MailSender: def send_mail(self, message) print(“Sending mail to ” + self.email) # e-mail logic here # END send_mail. # END class.

6. Multiple Inheritance • So now we can create a new class that uses both Contact and our new class MailSender class EmailableContact(Contact,MailSender): # Do stuff # END class.

7. Multiple Inheritance • So defining a class that uses multiple inheritance works a lot like calling a method with a number of parameters. We can test the new program with the following: >>>e = EmailableContact(“John Smith”, “[email protected]”) >>> e.send_mail(“Hello, test email”) Sending mail to [email protected]

8. etc.

Python: Multiple Inheritance

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Python: Multiple Inheritance