String Manipulation || Sumita Arora || Class 11 || Practical || Computer Science || Solution

String Manipulation || Sumita Arora || Class 11 || Practical || Computer Science || Solution

P.I.P: - 5.1

Q1. What would Python return when following expressions are evaluated? As earlier, first evaluate these expressions on paper and then verify by writing them in Python shell.

Given:

a = "hello"

b = 15

c = 20

d = "12"

Q2. What expression would you form so that from the given values, the desired result is obtained?

You can use any string manipulation operators, methods along with str () and int () functions.

 

 
	 
 
	 
Values
 
	 
Desired result
 
	 
Expression
 
 
 
	 
(a)
 
	 
a = "30"
b = 20
c = 50
d = "12"
 
	 
20501230
 
	 
 
 
 
	 
(b)
 
	 
b = 40
a = str(40)
c = 20
d = "12"
 
	 
"40201240"
 
	 
 
 
 
	 
(c)
 
	 
a = "hello"
b = 1
d = "2"
c = 20
 
	 
"1202 hello"
 
	 
 
 

Q3. What would be the possible output of the following code fragments?

 
	 
 
	 
Code
 
	 
Output
 
	 
Verify
 
 
 
	 
(a)
 
	 
a = 4
b = 2
print ("hi" * (a/2))
 
	 
 
	 
 
 
 
	 
(b)
 
	 
name = "python"
print (name.upper())
 
	 
 
	 
 
 
 
	 
(c)
 
	 
name = "FRED"
print (name.lower())
 
	 
 
	 
 
 
 
	 
(d)
 
	 
name = "humberside"
print (name [:2])
 
	 
 
	 
 
 
 
	 
(e)
 
	 
a = "Middlebury"
print (a [4:8])
print (a [8:12])
 
	 
 
	 
 
 

Q4. Given a string as follows:

truehuman = "Loves One and All"

Write the Python expression using string slices (e.g., truehuman [n : m] ) that will produce the given output string. As earlier, verify by typing them in Python Shell. (You can use only one of the string functions, operators with the slices)

 
	 
 
	 
Desired Output
 
	 
String slice
 
 
 
	 
(a)
 
	 
'One an'
 
	 
 
 
 
	 
(b)
 
	 
'd All'
 
	 
 
 
 
	 
(c)
 
	 
‘LOVES O’
 
	 
 
 
 
	 
(d)
 
	 
"AND "
 
	 
 
 
 
	 
(e)
 
	 
'and LOVES'
 
	 
 
 
 
	 
(f)
 
	 
'ALL IN One'
 
	 
 
 

Q5. Using the string truehuman = 'Loves One and All', what would be returned by following string slices?

 
	 
 
	 
Expression
 
	 
Output string
 
 
 
	 
(a)
 
	 
truehuman [- 7 : - 3]
 
	 
 
 
 
	 
(b)
 
	 
truehuman [ - 3 :]
 
	 
 
 
 
	 
(c)
 
	 
truehuman [- 9 : - 3]
 
	 
 
 
 
	 
(d)
 
	 
truehuman [: 10]
 
	 
 
 
 
	 
(e)
 
	 
truehuman [12 :]
 
	 
 
 
 
	 
(f)
 
	 
truehuman [10 : -12]
 
	 
 
 
 
	 
(g)
 
	 
truehuman [9:] + truehuman [:9]
 
	 
 
 
 
	 
(h)
 
	 
truehuman [: 9] + truehuman [9 : ]
 
	 
 
 

Q6. Write a Python program that should perform the following four tasks:

(i) After getting a word (of input) from the user, your program should use a while (or for) loop to print out each of the letters of the word. Just remember that strings in Python start with element 0!

(ii) Your program should then use another loop to print out each of the letters of the (same) word in reverse order!

(ii) Make a new variable that is the original word in reverse and print that variable. You can do this very easily in Python with a "string slice".

(iv) Ask the user for a letter to count. Use another loop to count how many times that letter appears in the original word. Print out this count.

Q7. Twisted Pig Latin. Prompt the user to enter a single ward. Then form a new word by taking the first letter of the original word, moving it to the end, and adding ‘ay’. Thus ‘school’ becomes "choolsay".

Q8. Write a loop that prints out the index of every ‘i’ in ‘Mississippi’.

Q9. Write a program that prompts the user for two strings and checks if one of the strings is a prefix of the other. Print an appropriate message to inform the user which is the prefix of which or that neither is a prefix. For example, if the user input "evergreen" and "ever", the program would respond: "ever" is a prefix of "evergreen". But if the input was "evergreen" and "green", the program would respond that neither is a prefix of the other.

Q10. Write a program that prompts the user for a string s and a character c, and outputs the string produced from s by capitalizing each occurrence of the character c in s and making all other characters lowercase.

Q11. Write a program that inputs a word and prints "Yes it starts !!" if the given word starts with "0", "1", "2", ... , "9".

Q12. Write a program that prompts a user for their "password" and then determines if the password is valid or not. A password is said to be valid if it starts with a digit and it has length 6 or more. If your program determines that the user-entered password is not valid, it should print a message saying so. Otherwise, it should print a message saying that it has accepted the user-entered password.