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12th Standard English Medium Computer Science Subject Strings and String Manipulations Book Back 3 Mark Questions with Solution updated Book back Questions

Published on: 13/05/2022

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Std: 12th Standard - Computer Science

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Questions:

Generic 3

5 x 3 = 15

Write a note about count( ) function in python.

What is the use of format( )? Give an example.

What will be the output of the given python program?
str1 = "welcome"
str2 = "to school"
str3 = str1[:2] + str2[len(str2)-2:]
print (str3)

Write a short about the followings with suitable example:
(a) capitalize( )
(b) swapcase( )

Write a Python program to display the given pattern
C O M P U T E R
C O M P U T E
C O M P U T
C O M P U
C O M P
C O M
C O
C

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Answers Key:

Generic 3

5 x 3 = 15

Syntax	Description	Example
count (str,beg,end)	Returns the number of substrings Occurs within the given range. Remember that substring may be a single character. Range (beg and end) arguments are optional. If it is not given, python searched in whole string. Search is case sensitive.	>>>str1="Raja Raja Chozhan" >>>print(str1.count("Raja")) 2 >>>print(str1.count("r")) 0 >>>print(str1.count("R")) 2 >>>print(str1.count("a")) 5 >>>print(str1.count('a',0,5)) 2 >>>print(str1.count('a',11)) 1

(i) The format( ) function used with strings is very versatile and powerful function used for formatting strings.
(ii) The curly braces {} are used as placeholders or replacement fields which get replaced along with format( ) function.
Example:
num1 = int (input("Number 1:"))
num2 = int (input("Number 2:"))
print ("The, sum of {} and {} is {}". format (num1, num2, (num1 + num2)))
Output:
Number 1: 34
Number 2: 54
The sum of 34 and 54 is 88.

Output:
Weool

Syntax	Description	Example
(a) capitalize()	Used to capitalize the first character of the string	>>> city="chennai" >>> print(city, capitalize( )) Chennai
(b) swapcase( )	It will change case of every character to its opposite case vice-versa.	>>> strl="tAmilL NaDu" >>>print(strl.swapcase( )) TaMIl nAdU