gu-ito-2-17.py

'''You are developing a Python program for managing various shapes in a geometry application. The program should support different types of shapes, such as circles, rectangles, and triangles. Each shape has its own unique attributes and methods.

Write a Python script that demonstrates method overloading in the context of different shape classes. Your program should accomplish the following tasks:

Define a base class called Shape.
Implement different subclasses for various shapes, such as Circle, Rectangle, and Triangle.
Each shape class should have methods to calculate its area and perimeter.
Demonstrate method overloading by implementing different versions of the area and perimeter methods for each shape class.
Ensure the following operations can be performed:

Calculate the area and perimeter of a circle.
Calculate the area and perimeter of a rectangle.
Calculate the area and perimeter of a triangle.
Your program should continuously prompt the user for shape inputs until the "quit" command is entered.

Provide appropriate error handling for invalid inputs. Display a message in the following format for invalid inputs: "Invalid input. Please enter a valid shape (circle/rectangle/triangle)."

Sample Input:

circle
5
rectangle
4 6
triangle
3 4 5
quit

Sample Output:

Area of the circle: 78.54
Perimeter of the circle: 31.42
Area of the rectangle: 24.0
Perimeter of the rectangle: 20.0
Area of the triangle: 6.0
Perimeter of the triangle: 12.0
Quitting the program.

Explanation:

The user selects a shape and provides the necessary dimensions.
The program calculates the area and perimeter based on the provided inputs and shape type.
The process continues until the user enters "quit." If the user enters an invalid shape, an appropriate error message is displayed.
'''



import math

class Shape:
    #..... YOUR CODE STARTS HERE .....
    def area(self):
        pass
    
    def perimeter(self):
        pass
    
    
    #..... YOUR CODE ENDS HERE .....

class Circle(Shape):
    #..... YOUR CODE STARTS HERE .....
    
    def area(self,radius):
        self.radius=radius
        return math.pi*self.radius*self.radius
        
    def perimeter(self,radius):
        self.radius=radius
        return (2*math.pi*self.radius)
    
    
    #..... YOUR CODE ENDS HERE .....

class Rectangle(Shape):
    #..... YOUR CODE STARTS HERE .....
    
    def area(self,lenght,breath):
        self.lenght=lenght
        self.breath=breath
        return self.lenght*self.breath
        
    def perimeter(self,lenght,breath):
        self.lenght=lenght
        self.breath=breath
        return (2*(self.lenght+self.breath))
        
    
    
    #..... YOUR CODE ENDS HERE .....

class Triangle(Shape):
    #..... YOUR CODE STARTS HERE .....
    def perimeter(self,a,b,c):
        self.a=a
        self.b=b
        self.c=c
        return self.a+self.b+self.c
        
    def area(self,a,b,c):
        self.a=a
        self.b=b 
        self.c=c 
        s= (self.a+self.b+self.c)/2
        return (math.sqrt(s*(s-self.a)*(s-self.b)*(s-self.c)))
    
    
    #..... YOUR CODE ENDS HERE .....

def main():
    shape_classes = {'circle': Circle(), 'rectangle': Rectangle(), 'triangle': Triangle()}
    while True:
        shape = input().lower()
        if shape == 'quit':
            print("Quitting the program.")
            break
        elif shape not in shape_classes:
            print("Invalid input. Please enter a valid shape (circle/rectangle/triangle).")
            continue

        dimensions = list(map(float, input().split()))
        print("Area of the {}: {:.2f}".format(shape, shape_classes[shape].area(*dimensions)))
        print("Perimeter of the {}: {:.2f}".format(shape, shape_classes[shape].perimeter(*dimensions)))

if __name__ == "__main__":
    main()