Python Classes and Objects Examples

Example 1
#create a class for a circle
class mycircle:
#private variable
    __pi=22/7
    def set_radious(self,r):
        self.__r=r

    def get_radious(self):
        return self.__r
#constructor
    def __init__(self,r):
        self.set_radious(r)
#function to return area of a circle
    def get_area(self):
        return self.__r*self.__r*(self.__pi)
#function to return circumferences
    def get_circumference(self):
        return 2*self.__pi*self.__r

    def __str__(self): 
        return "Circle radous:" + str(self.get_radious()) + " Area:"+ str(self.get_area()) + " Circumference: " +str(self.get_circumference())
#end of class

#main program
#create object and return string to variable x
x=mycircle(7)
print(x)

Output
Circle radous:7 Area:154.0 Circumference: 44.0

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Example 2
#create a class for rectangle
class myRect:
 
    def set_width(self,w):
        self.w=w

    def set_height(self,h):
        self.h=h

    def get_width(self):
        return self.w

    def get_height(self):
        return self.h

    def __init__(self,w,h):
        self.set_width(w)
        self.set_height(h)

    def get_area(self):
        return self.w * self.h

    def get_circumference(self):
        return 2*(self.w+self.h)

    def __str__(self): 
        return "Rectangle Area:"+ str(self.get_area()) + " Circumference: " +str(self.get_circumference())

#main program
x=myRect(4,2)
print(x)

Output
Rectangle Area:8 Circumference: 12