Binary
File Manipulation (Dictionary)
import pickle
from os import remove, rename
def Create():
with
open("emp.dat", "wb") as File:
while
True:
Eno
= int(input("Eno: "))
Name
= input("Name: ")
Sal
= float(input("Salary: "))
Dept
= input("Department: ")
Emp
= {"Eno": Eno, "Name": Name, "Sal": Sal,
"Dept": Dept}
pickle.dump(Emp, File)
Ans
= input("More (Y/N)? ")
if
Ans in 'nN':
break
def Disp():
try:
with
open("emp.dat", "rb") as File:
while True:
Emp = pickle.load(File)
print(Emp)
except
EOFError:
pass
except
FileNotFoundError:
print("File not found.")
except
Exception as e:
print("An error occurred:", e)
def searcheno():
Seno =
int(input("Enter Employee no to search - "))
found =
False
try:
with
open("emp.dat", "rb") as File:
while True:
Emp = pickle.load(File)
if Emp["Eno"] == Seno:
print("Record Found:", Emp)
found = True
break
except
EOFError:
if not
found:
print("No such Record Found")
except
FileNotFoundError:
print("File not found.")
def searchenm():
Senm =
input("Enter Employee name to search - ")
found =
"n"
try:
with
open("emp.dat", "rb") as File:
while True:
Emp = pickle.load(File)
if Emp["Name"] == Senm:
print(Emp)
found = "y"
except
EOFError:
pass
if found ==
"n":
print("No such Record Found")
import pickle
def CountDept():
ctr = 0
Sdept =
input("Enter Department - ")
try:
with
open("emp.dat", "rb") as File:
while True:
Emp = pickle.load(File)
if Emp["Dept"] == Sdept:
print(Emp)
ctr += 1
except
EOFError:
pass
print("No. of Employees in", Sdept, "-", ctr)
def Countsal():
ctr = 0
try:
with
open("emp.dat", "rb") as File:
while True:
Emp = pickle.load(File)
if Emp["Sal"] > 6000:
# print(Emp) # Uncomment if you want
to display each employee
ctr += 1
except
EOFError:
pass
print("No. of employees with Salary > 6000 -", ctr)
def highestsal():
try:
with
open("emp.dat", "rb") as file:
#
Read the first record to initialize highest salary
Emprec = pickle.load(file)
hsal
= Emprec["Sal"]
#
Read remaining records
while True:
Emprec = pickle.load(file)
if Emprec["Sal"] > hsal:
hsal = Emprec["Sal"]
except
EOFError:
print("Highest Salary -", hsal)
except
FileNotFoundError:
print("File not found.")
except
Exception as e:
print("Error:", e)
def EditOnEmpno():
file =
open("emp.dat", "rb")
tempfile =
open("temp.dat", "wb")
found =
"n"
Seno =
int(input("Enter Employee no to Edit - "))
try:
while
True:
Emp
= pickle.load(file)
if
Emp["Eno"] == Seno:
eno = Emp["Eno"]
Name = input("Edited Name: ")
Sal = float(input("Edited Salary: "))
Dept = input("Edited Department: ")
Empnew = {"Eno": eno, "Name": Name, "Sal":
Sal, "Dept": Dept}
found = "y"
pickle.dump(Empnew, tempfile)
else:
pickle.dump(Emp, tempfile)
except
EOFError:
file.close()
tempfile.close()
if found ==
"n":
print("No such record")
remove("temp.dat")
else:
remove("emp.dat")
rename("temp.dat", "emp.dat")
print("Record updated successfully.")
def Editname():
file =
open("emp.dat", "rb")
tempfile =
open("temp.dat", "wb")
found =
"n"
nm = input("Enter Employee name to Edit
- ")
try:
while
True:
Emp
= pickle.load(file)
if
Emp["Name"] == nm:
eno = Emp["Eno"]
Name = input("Edited Name: ")
Sal = float(input("Edited Salary: "))
Dept = input("Edited Department: ")
Empnew = {"Eno": eno, "Name": Name, "Sal":
Sal, "Dept": Dept}
found = "y"
pickle.dump(Empnew, tempfile)
else:
pickle.dump(Emp, tempfile)
except
EOFError:
file.close()
tempfile.close()
if found ==
"n":
print("No such record")
remove("temp.dat")
else:
remove("emp.dat")
rename("temp.dat", "emp.dat")
print("Record updated successfully.")
def EditOnrecno():
file =
open("emp.dat", "rb")
tempfile =
open("temp.dat", "wb")
found =
"n"
n =
int(input("Enter record no to Edit - ")) # record number starts from 1
rec = 1 # record counter
try:
while
True:
Emp
= pickle.load(file)
if
rec == n:
eno = Emp["Eno"]
Name = input("Edited Name: ")
Sal = float(input("Edited Salary: "))
Dept = Emp["Dept"]
Empnew = {"Eno": eno, "Name": Name, "Sal":
Sal, "Dept": Dept}
found = "y"
pickle.dump(Empnew, tempfile)
else:
pickle.dump(Emp, tempfile)
rec
+= 1
except
EOFError:
file.close()
tempfile.close()
if found ==
"n":
print("No such record")
remove("temp.dat")
else:
remove("emp.dat")
rename("temp.dat", "emp.dat")
print("Record updated successfully.")
def EditOndept():
file =
open("emp.dat", "rb")
tempfile =
open("temp.dat", "wb")
found =
"n"
Sdept =
input("Enter record no to Edit - ")
rec = 1
try:
while
True:
Emp
= pickle.load(file)
if
Emp["Dept"] == Sdept:
eno = Emp["Eno"]
Name = input(" Edited Name :")
Sal = float(input(" Edited Salary:"))
Dept = input("Edited Department :")
Empnew = {"Eno": eno, "Name": Name, "Sal":
Sal, "Dept": Dept}
found = "y"
pickle.dump(Empnew, tempfile)
else:
pickle.dump(Emp, tempfile)
rec
+= 1
except
EOFError:
file.close()
tempfile.close()
if found ==
"n":
print("No such record")
remove('temp.dat')
else:
remove('emp.dat')
rename('temp.dat', 'emp.dat')
print("Record updated successfully.")
while True:
CH = input(
"1.
Create\n"
"2.
Display\n"
"3.
Search by Emp No\n"
"4.
Search by Emp Name\n"
"5.
Count Records of a Given Department\n"
"6.
Modify by Emp No\n"
"7.
Display Highest Salary\n"
"8.
Quit\n"
"Enter your choice (1-8): "
)
if CH ==
'1':
Create()
elif CH ==
'2':
Disp()
elif CH ==
'3':
searcheno()
elif CH ==
'4':
searchenm()
elif CH ==
'5':
CountDept()
elif CH ==
'6':
EditOnEmpno()
elif CH ==
'7':
highestsal()
elif CH ==
'8':
break
else:
print("Invalid choice. Please enter a number between 1 and
8.")
[E_ID, E_Name, Designation, Salary]
Example: [101, "Ravi", "PGT", 98000], [102, "Roja", "TGT", 89000], …
Write Python functions to perform the following operations:
(i) Add_emp()
To input details of employees and store the records in the binary file EMP.DAT using the pickle module.
(ii) Update_sal()
To increase the salary of all employees having designation "PGT" by 10% and update the changes in the file.
(Use a temporary file along with remove() and rename() functions.)
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