Question

A binary file “Book.dat” has structure [BookNo, Book_Name, Author, Price]. 

i. Write a user defined function CreateFile() to input data for a record and add to Book.dat . 

ii. Write a function CountRec(Author) in Python which accepts the Author name as parameter and count and return number of books by the given Author are stored in the binary file “Book.dat”

Answer 1

Using of any correct code giving the same result is also accepted.

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() 

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