File Handling Sumita Arora Practical Class 12 Computer Science Solution

File Handling Sumita Arora Practical Class 12 Computer Science Solution

P.I.P :- 5.1

Q1. Consider the file “SarojiniPoem.txt”

Autumn Song

Like a joy on the heart of a sorrow,
The sunset hangs on a cloud; 
A golden storm of glittering sheaves, 
Of fair and frail and fluttering leaves, 
The wild wind blows in a cloud. 

Hark to a voice that is calling 
To my heart in the voice of the wind: 
My heart is weary and sad and alone, 
For its dreams like the fluttering leaves have gone, 
And why should I stay behind? 

Sarojini Naidu

Based on the above file, answer the following question:

(a) What would be the output of following code? 
file = open ("sarojiniPoem.txt","r")
text = file.readlines()
file.close()
for line in text  :
    print (line , end = ' ' )
print ( )
(b) Modify the program so that the lines are printed in reverse order.
(c) Modify the code so as to output to another file instead of the screen. Let your script overwrite the output file. 
(d)Change the script of part (c) that it append output to an existing file.
(e) Modify the program so that each line is printed with a line number at beginning.

Q2. Write a program to print following type of statics for the given file:

16824 line in the file 
    438 empty lines
   53.7 average characters per line 
   65.9 average characters per non – empty line 

Q3. Write a program that asks a new user about userid and password and then appends it to file “security. txt” provided the give userid does not exist in the file . If it does, then display error message “User id already exist”and prompt the user to re-enter the userid. Also, make sure that the password is a least 8 characters long with at least a digit and a special character out of “$, @and %” in it.

Q4. Given a file 'mine.txt' as shown below:

    I am Line 1
    I am Line 3
What would be the output of the following code?
print (file("mine.txt").readlines())

Q5. Write a program that prompt the user for a file name and then read and prints the contents of the requested file in the upper case.

Q6. Write a program that reads a text file and then create a new file where each character‘s case is inverted.

Q7. Create a file phonebook.det that stores the details in following format:

Name Phone
Jiving 8666000
Kriti 1010101
:
Obtain the details from the user.

Q8. Write a program to append more details to file “phonebook.det”.

Q9. Write a program to edit the phone number of “Arvind” infile “phonebook.det”. If there is no record for “Arvind”, report error.

Q10. Write a Python program to create a binary file Items.dat to store Item details of some items as per {itemno, name, price, category}.

Q11. Write a program to append some records to the binary file Items.dat, created in the previous program.

Q12. Write a Python program to modify the price of an item in the binary file Items.dat created data. Get the itemno of the item to be modified from the user.

Q13. Write a Python program to create a binary file Itemnew.dat storing all the item details of binary file Items.dat except for the item whose itemno is obtained from the user, e.g., if user gives Itemno as 1005, then Itemnew.dat should store all 'items' details of Items.dat except item 1005.

Q14. Write a Python program to get 10 items' details (itemno, name, price, category) from the user and create a CSV file (Items.csv).

Q15. Write a Python program to create a csv file (Itemnew.csv) same as the previous program, but with a delimiter character as pipe (|)

Q16. Write a program to read a file Itemnew.csv and search for an item whose itemno is obtained from the user, as the keyboard input.

Q17. Write a program to read from a file Items.csv and create a file highitems.csv, containing only those item details from Items.csv where price > 250.