Question

Q30. A binary file BOOK.DAT has structure (book no., book name ,author name and price ).
(i). Write a user defined function Create_File( ) to input data for a record and add to BOOK.DAT.
(ii). Write a user defined function Count_Rec( ) which accept the author name as parameter,
count and return number of a records given by the author in binary file BOOK.DAT.

Answer 1

Answer:

(i)import pickle

def createFile():

fobj=open("Book.dat","ab")

BookNo=int(input("Book Number : "))

Book_name=input("Name :")

Author = input(“Author: “)

Price = int(input("Price : "))

rec=[BookNo,Book_Name,Author,Price]

pickle.dump(rec,fobj)

fobj.close()

(ii)def CountRec(Author):

fobj=open("Book.dat","rb")

num = 0

try:

while True:

rec=pickle.load(fobj)

if Author==rec[2]:

num = num + 1

except:

fobj.close()

return num

Explanation:

Answer 2

(i) Take input according to the given structure using the while loop, until the user enters "exit" or "Exit"

def CreateFile():

   f = open("Book.dat", "wb")

   while True :

       num = int(input("Enter Book No. :- "))

       name = input ("Enter Book Name :- ")

       aut = input("Enter Author :- ")

       pri = float(input("Enter Price of Book :- "))

       lst= [ num, name, aut, pri]

       pickle.dump( lst, f)

       choice = input("To exit (Type exit):- ")

       print()

       if choice == "exit" or choice == "Exit":

           print("Thank you")

           print()

           break

   f.close()

(ii) Take the author name in as the arguments, and using file handling open the Book.dat file to check for the given author.

def CoutRec(aut):

   print("For Searching -", aut)

   f = open("Book.dat", "rb")

   count = 0

   try :

       while True:

           data = pickle.load(f)

           if data[2] == aut :

               count += 1

   except EOFError:

       f.close()

   print("Number of Book with Author name", aut , "=", count)

[Note: pickle is a python library. The first line will be "import pickle"]

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