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CLASSES AND OBJECTS
CLASS• A Class is a way to bind the data and itsassociated functions together.• An object is an instance of a class.• Ideas about classes are:– A class can have subclasses that can inherit all orsome of the characteristics of the class.– Subclasses can also define their own methods andvariables that are not part of their superclass.
ACCESS SPECIFIER• private -members of a class are accessibleonly from within other members of the sameclass• protected -members are accessible frommembers of their same class and frommembers of their derived classes.• public members are accessible from anywherewhere the object is visible
Access Specifier in python• There are only public or private attributes• Private-Anything that starts with twounderscores is private to the class (or module).• Everything else is publicEg:-class Simple(object):def __init__():self.__x = 0
Declaring a class in pythonclass name:statements
OBJECT• An object that contains information about auser-defined type• An object represents an entity in the real world• Distinctly identified• For example, a student, a desk, a circle• An object has an unique identity, state, andbehaviors.– State-properties– Behavior-a set of methods.
Built-In Class Attributes:__dict__ : Dictionary containing the classs namespace.__doc__ : Class documentation string, or None ifundefined.__name__: Class name.__module__: Module name in which the class isdefined. This attribute is "__main__" in interactivemode.__bases__ : A possibly empty tuple containing thebase classes, in the order of their occurrence in thebase class list.
Examplesclass class1 :name = “Classes in Python”difficulty= “easy”>> print class1.nameClasses in Python>> print class1.difficultyeasy
>> object1 = class1()>> print object1.nameClasses in python•Defining Methods/functions in classesclass tutorials :name = “Classes in Python”difficulty= “easy”def printname(self,name) :print self.name
>> you = tutorials()>> me = tutorials()>> you.printname(“aneesh”)OutputClasses in Python
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