Write a program to increase the salary by Rs. 2000/- of the employee having empno

Q. Write a program to increase the salary by Rs. 2000/- of the employee having empno as 1251 in the file empl.dat.

You can understand by Watching video :-

Answer :-

import pickle
emp = {}
found = False
fin = open('empl.dat', 'rb+')
fin.seek (0)
try:
    while True :
        rpos = fin.tell()
        emp = pickle.load(fin)
        if emp['Empno'] == 1251 :
            emp[ 'Salary'] = emp['Salary'] + 2000
            fin.seek (rpos)
            pickle.dump(emp, fin)
            print (emp)
            found = True
except EOFError:
    if found == False:
        print("Sorry, no matching record found.")]
    else:
        print("Record(s) successfully updated.")
    fin.close()

For Output, At frist we have to write something in the emp.dat file by the following code :-

import pickle

f = open("empl.dat","wb")

while True :
    empno = int(input ("Enter Empno. ( for exit enter -1 ):- "))
    if empno == -1 :
        print()
        break
    name = input( "Enter Name of Employee :-")
    sal = float(input("Enter Salary of Employee :- "))
    dic = { 'Empno' : empno , "Name" : name, 'Salary' : sal }
    pickle.dump( dic ,  f )
    print()
print("All Data are written Successfully ")
f.close()

Output writing script :-

Enter Empno. ( for exit enter -1 ):- 7854
Enter Name of Employee :-Path
Enter Salary of Employee :- 4758
Enter Empno. ( for exit enter -1 ):- 4557
Enter Name of Employee :-WaLLA
Enter Salary of Employee :- 46546.74

Enter Empno. ( for exit enter -1 ):- 1251
Enter Name of Employee :-Portal
Enter Salary of Employee :- 599

Enter Empno. ( for exit enter -1 ):- -1

All Data are written Successfully 
>>> 

The output of the Main Program :-

{'Empno': 1251, 'Name': 'Portal', 'Salary': 2599.0}
Record(s) successfully updated.
>>>