Phython Study Notes-a preliminary understanding of the class, phython Study Notes

Phython Study Notes-a preliminary understanding of the class, phython Study Notes

Class is the core of object-oriented programming. It plays the role of relevant data and logical containers. They provide blueprints for creating instance objects. The python language does not require Object-Oriented Programming (different from JAVA). Here is a simple example.

How to define a class

class Classname(base_class[es]):         "optional documentation string"          static_menber_declarations
          method_declarations

You can use the Class keyword to define a Class and provide an optional server or base Class. If there is no suitable Class, you can use the object Class.

Example:

 class FooClass(object):    """my very frist class:FooClass"""    version=0.1    def _init_(self,nm='Jack Franklin'):        """Constructor"""        self.name=nm        print 'Created a class instance for',nm    def showname(self):        """display instance attribute and class name"""        print 'Your name is',self.name        print 'My name is',self._class_._name_    def shoever(self):        """"display class(static)attributr"""        print self.version    def addMe2Me(self,x):        return x+x

Note that after an instance of a class is created, the _ init _ () method is automatically executed, similar to the constructor in JAVA.

What is self? It is a reference of the class instance itself, which is equivalent to this in other languages.

How to create a class instance:

>>>foo1=FooClass()Created a class instance for Jack Franklin>>>fool.showname()Your name is Jack FranklinMy name is _main_.FooClass>>>print foo1.addMe2Me(5)10