A binary file Book.dat has structure [BookNo, Book Name, Author, Price]. Write a user defined functi
Sumita Arora File handling Solution Class 12 CS IP
Q. 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".
Website Link :-
https://www.pathwalla.com/2022/05/a-b...
Answer :-
import pickle
def CreateFile():
f = open("Book.dat", "wb")
while True :
num = int(input("Enter Book Number :- "))
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("For exit (Enter exit):- ")
print()
if choice == "exit" or choice == "Exit":
print("Thank you")
print()
break
f.close()
def CoutRec(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)
CreateFile()
print("For Searching -")
aut = input("Enter Author :- ")
CoutRec(aut)
Output :-
Enter Book Number :- 1
Enter Book Name :- Python
Enter Author :- Path Walla
Enter Price of Book :- 150.0
For exit (Enter exit):- no
Enter Book Number :- 51
Enter Book Name :- Css
Enter Author :- Portal Express
Enter Price of Book :- 89.5
For exit (Enter exit):- no
Enter Book Number :- 100
Enter Book Name :- Html
Enter Author :- CP
Enter Price of Book :- 158.6
For exit (Enter exit):- no
Enter Book Number :- 111
Enter Book Name :- C++
Enter Author :- Path Walla
Enter Price of Book :- 145.6
For exit (Enter exit):- exit
Thank you
For Searching -
Enter Author :- Path Walla
Number of Book with Author name Path Walla = 2