Object Oriented Programming using Python — DU B.Sc. (Hons) Computer Science Previous Year Question Papers

Q1 (a) Draw a flowchart to compute the factors of a given number. (5) (b) Write python statements for the following (6) i. Initializing x to 7 and incrementing the value by 1 ii. Assign a string to the variable str and print the subset of characters of the string. iii. Store the integer division of x and y in z (c) Write a function to check whether a given number is prime or not. (5) (d) Give the output of the following code snippet: (6) sum+=x print (sum) ii. str='Hello' print (stri::-1]) (e) Given the following dictionary (8) Write python statements for the following: i. Create the list of names and marks separately from the dictionary d. ili. Display the list of names and marks in the following format Name marks_obtained Q2 (a) Write a function in python reverse (1st) that takes list 1st as a parameter and (5) returns the reverse of 1st in a new list. (b) Write a program to generate the following pattern where the height of the pattern, 'h', (5) is input from the user. (c) Give the output of the following code: 1. print (56**2//1883) print (10!=9 and 38>=38) 1ii.. print ("Nelcome'*4) 'Hello') iv. print ('1' in v. print (16^23) Q3 (a) Write a function that takes a string as input and returns the number of characters, vowels (5) and words as a tuple. (0) Lei's assume a siring-stri= 'house no123 , Rajnagar Extension, Uttar Pradesh', Whet will be the output on executing each of the following statements: i. print (strl.find ('no')) ii. print (strl.split (' ')) iv. print (strl.is alpha)) v. print(str1.replacer'e'u')) (c) Write a program using function to swap two numbers with and without using a (5) temporary variable. 04 (a) Given the output of the following code snippets ii. subject=' computer' subject-list (subject) for 1 in range (0, len (subject) -1) : subject [1] subject [1+1] subject [len (subject) -1]-ch print (' .join(subject)) Fruits-| 'lemon', 'orange', 'grapes', 'apple', 'pineapple', 'ki wi') Vegetables-('spinach', 'caultiflower', 'lady finger') print (Fruits and Vegetables) print (Fruits or Vegetables) print (Fruits. add ('Pomegranate')) (b) Write a program that takes a sentence as input and computes the frequency of vowels (6) in it. Create a dictionary 'd" to store the vowels and their frequency present in the sentence. Q5 (a) Write a function that reads the file "flle1. txt" and copies odd-numbered lines to (5) another file, 'file2. txt'. Use appropriate exception handling during the file operations. (b) Consider the following function computeSquareRoot () (6) import math def computesquareRoot () : a-int (input ('Enter the value')) result-math.sqrt (a) except ValueError: print ('value error') except TypeError: print ('typeerror') print ('unexpected error') print (result) print ('End task') Determine the output for the above function call when the value entered for a= "h', a=' 13' and a=' -56' (c) Find the error in the following code snippet: (4) F1=open ('Al.txt') F1. write ('welcome')