Class XII: Python Data File Handling | Binary Files

Delete a record from binary file using employee code

import pickle
import os

#function definition
def delete_empno():
     try:
          z=0
          tr=int(input("Enter Empno to delete "))
          f=open("emp","rb")
          tf=open("temp","wb")
          print("Empno","Name","Salary")
          while True:
               rec=pickle.load(f)
               if rec[0]==tr:
                    z=1
                    print(rec[0],rec[1],rec[2])
               else:
                    pickle.dump(rec,tf)

     
     except EOFError:
          f.close()
          tf.close()
          if z==0:
               print("Record not found")
          else:
               os.remove("emp")
               os.rename("temp","emp")

     except IOError:
          print("Unable to open the file")

#function calling
delete_empno()

Update a record from binary file using employee code

import pickle
import os

#function definition
def update_empno():
     try:
          z=0
          tr=int(input("Enter Empno to update "))
          f=open("emp","rb")
          tf=open("temp","wb")
          print("Empno","Name","Salary")
          while True:
               rec=pickle.load(f)
               if rec[0]==tr:
                    z=1
                    print("Old Record")
                    print(rec[0],rec[1],rec[2])
                    print("Enter new data ")
                    empno=int(input("Enter Empno "))
                    name=input("Enter name ")
                    name=name.upper()
                    sal=float(input("Enter Salary "))
                    rec=[empno,name,sal]
               pickle.dump(rec,tf)

     
     except EOFError:
          f.close()
          tf.close()
          if z==0:
               print("Record not found")
          else:
               os.remove("emp")
               os.rename("temp","emp")

     except IOError:
          print("Unable to open the file")

#function calling
update_empno()