NCERT Solutions for Class 12 Computer And Communication Technology Computer Science With Python Chapter 2 Concept Of Object Oriented Programming

List four characteristics of Object Oriented programming.

class Test:
	rollno=1
	marks=75
	def __init__(self,r,m): #function 1
		self.rollno=r
		self.marks=m
	def assign(self,r,m):     #function 2
		rollno = r
		marks = m
	def check(self):          #function 3
		print self.rollno,self.marks
		print rollno,marks

(i) In the above class definition, both the functions - function 1 as well as function 2 have a similar definition. How are they different in execution?

(ii) Write statements to execute function 1 and function 2.

List four characteristics of Object Oriented programming.

What is the difference between Multilevel and Multiple inheritance? Give suitable examples to illustrate both.

What will be the output of the following python code considering the following set of inputs?

JAYA
My 3 books
PICK2
2120

Also, explain the try and except used in the code.

Counter=0
while True:
	try:
		Number=int(raw_input('Give a Number'))
		break
	except ValueError:
		Counter=Counter+2
		print('Reenter Number')
print(Counter)

Write a class CITY in Python with following specifications
Instance Attributes

-Code   # Numeric value
-Name # String value
-Pop      #Numeric value of population
-KM      # Numeric value
-Density #Numeric value for Population Density

Methods:
CalDen()# Method to calculate Density as Pop/KM
Record()# Method to allow user to enter values
Code,Name,Pop,KM and call CalDen() method
See()# Method to display all the members also display
              a message ”Highly Populated Area” 
              if the Density is more than 12000