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OUTPUT:
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#Practical Program Create a binary file with name and roll number.
#Search for a given roll number and display the name, if not found
#display appropriate message.
import pickle
import sys
dict={}
def write_in_file():
file=open("D:\\stud2.dat","ab") #a-append,b-binary
no=int(input("ENTER NO OF STUDENTS: "))
for i in range(no):
print("Enter details of student ", i+1)
dict["roll"]=int(input("Enter roll number: "))
dict["name"]=input("enter the name: ")
pickle.dump(dict,file) #dump-to write in student file
file.close()
def display():
#read from file and display
file=open("D:\\stud2.dat","rb") #r-read,b-binary
try:
while True:
stud=pickle.load(file) #write to the file
print(stud)
except EOFError:
pass
file.close()
def search():
file=open("D:\\stud2.dat","rb") #r-read,b-binary
r=int(input("enter the rollno to search: "))
found=0
try:
while True:
data=pickle.load(file) #read from file
if data["roll"]==r:
print("The rollno =",r," record found")
print(data)
found=1
break
except EOFError:
pass
if found==0:
print("The rollno =",r," record is not found")
file.close()
#main program
#Prepared by Ramesha K S
while True:
print("MENU \n 1-Write in a file \n 2-display ")
print(" 3-search\n 4-exit \n")
ch=int(input("Enter your choice = "))
if ch==1:
write_in_file()
if ch==2:
display()
if ch==3:
search()
if ch==4:
print(" Thank you ")
sys.exit()
Output
>>>
RESTART: C:\Users\Admin\AppData\Local\Programs\Python\Python36-32\p-rks-f-prac-30.py
MENU
1-Write in a file
2-display
3-search
4-exit
Enter your choice = 1
ENTER NO OF STUDENTS: 1
Enter details of student 1
Enter roll number: 1
enter the name: Abhijith
MENU
1-Write in a file
2-display
3-search
4-exit
Enter your choice = 2
{'roll': 1, 'name': 'Abhijith'}
MENU
1-Write in a file
2-display
3-search
4-exit
Enter your choice = 1
ENTER NO OF STUDENTS: 2
Enter details of student 1
Enter roll number: 2
enter the name: Mohith
Enter details of student 2
Enter roll number: 3
enter the name: Akshath
MENU
1-Write in a file
2-display
3-search
4-exit
Enter your choice = 2
{'roll': 1, 'name': 'Abhijith'}
{'roll': 2, 'name': 'Mohith'}
{'roll': 3, 'name': 'Akshath'}
MENU
1-Write in a file
2-display
3-search
4-exit
Enter your choice = 3
enter the rollno to search: 2
The rollno = 2 record found
{'roll': 2, 'name': 'Mohith'}
MENU
1-Write in a file
2-display
3-search
4-exit
Enter your choice = 3
enter the rollno to search: 6
The rollno = 6 record is not found
MENU
1-Write in a file
2-display
3-search
4-exit
Enter your choice = 1
ENTER NO OF STUDENTS: 1
Enter details of student 1
Enter roll number: 5
enter the name: Bidya
MENU
1-Write in a file
2-display
3-search
4-exit
Enter your choice = 2
{'roll': 1, 'name': 'Abhijith'}
{'roll': 2, 'name': 'Mohith'}
{'roll': 3, 'name': 'Akshath'}
{'roll': 5, 'name': 'Bidya'}
MENU
1-Write in a file
2-display
3-search
4-exit
Enter your choice = 3
enter the rollno to search: 5
The rollno = 5 record found
{'roll': 5, 'name': 'Bidya'}
MENU
1-Write in a file
2-display
3-search
4-exit
Enter your choice = 4
Thank you
>>>
Binary File:
