(a) Write one difference between CSV and text files. Write a program in Python that defines and calls the following user defined functions : (i) COURIER_ADD(): It takes the values from the user and adds the details to a csv file 'courier.csv'. Each record consists of a list with field elements as cid, s_name, Source, destination to store Courier ID, Sender name, Source and destination address respectively. (ii) COURIER_SEARCH() : Takes the destination as the input and displays all the courier records going to that destination. (ii) Search_Book(): Takes publisher name as input and counts and displays number of books published by them.

(a) Write a point of difference between append (a) and write (w) modes in a text file. Write a program in Python that defines and calls the following user defined functions : (i) Add_Teacher() : It accepts the values from the user and inserts record of a teacher to a csv file "Teacher.csv". Each record consists of a list with field elements as T_id, Tname and desig to store teacher ID, teacher name and designation respectively. (ii) Search_Teacher() : To display the records of all the PGT (designation) teachers. (ii) Count_Device() : To count and display number of peripheral devices, whose price is less than or equal to 1000.

Which of the following file opening mode is used to open a file in append and read mode ? (A) r+ (B) w+ (C) a+ (D) x+

(b) (i) Give one difference between write() and writeline() function in text file. (ii) A Binary file, "Items.dat" has the following structure : [Icode, Description, Price] Where Icode – Item code Description – Detail of item Price – Price of item Write a function Add_data(), that takes Icode, Description and Price from the user and writes the information in the binary file "Items.dat".

(b) Write a function in Python to display the line which has the maximum number of vowels from a text file, "Novel.txt"

A. Write a Python function that displays the number of times the word "Python" appears in a text file named "Prog.txt".

B. Write and call a Python function to read lines from a text file STORIES.TXT and display those lines which doesn't start with a vowel (A, E, I, O, U) irrespective of their case.

(a) Write a Python function that counts and returns the number of digits appearing in the text file "Space.txt". For example, if the file contains : Space exploration has unlocked incredible advancements in technology and science. Since the first moon landing in 1969, space agencies have sent probes to Mars, Jupiter and beyond. The ISS, orbiting Earth at about 400 km, serves as a hub for research. With missions planned for 2030, humanity's cosmic journey continues! Then the function should return 11.

(b) Write a Python function that displays the words in which the lowercase letter 'e' appears at least twice in the text file 'Space.txt'. For example, if the file contains : Space exploration has unlocked incredible advancements in technology and science. Since the first moon landing in 1969, space agencies have sent probes to Mars, Jupiter and beyond. The ISS, orbiting Earth at about 400 km, serves as a hub for research. With missions planned for 2030, humanity's cosmic journey continues! Then the function should display : incredible advancements science. agencies serves research.