Delete record in binary file python

Write a python program to delete student data from binary file with Practical Example

Program Description:

This program to read binary file and delete student record from it

Program Logic:

  • Include pickle module in the program by using import statement
  • Enter roll number of student using the input() function and store it in a variable say ‘roll’
  • Open binary file in read mode using open method and pass filename and rb+ mode to it.
  • Read binary file using load() function and store it in a variable say ‘filedata’.
  • Set value of found variable to zero
  • Create empty list object say ‘lst’
  • Use for loop to iterate through student data one by one
  • Check roll number present in student record using if loop within for loop
  • If condition is TRUE then append list object with student data
  • If condition is FALSE then set value of found variable to 1
  • Write data into list object from binary file using dump method when value of found variable is 1.
  • Print error message “Roll number does not found” using print function when found variable is zero.
  • Close the binary file using close() function.
  • The exit of the program.

Below is implementation code/Source code

import pickle
roll = input("Enter roll number whose record you want to delete:")
file = open("student.dat","rb+")
filedata = pickle.load(file)
found = 0
lst = [ ]
for x in filedata:
    if roll not in x['roll']:
        found = 1
if found == 1:
    print("Record Deleted")
else :
    print("Roll number does not found")
file = open("student.dat","rb")
f = pickle.load(file)

Below is Output

Enter roll number whose record you want to delete:11
Record Deleted
[{'roll': '13', 'sname': 'Sujata'}, {'roll': '15', 'sname': 'Lumbini'}]

Below is Snapshot of Executable code with Output

You can also check this too

  1. Python program to modify or update student data from binary file
  2. Python program to get mode and encoding format of file
  3. Python program to search specific data in binary file
  4. Python program to create list of email ids and write list into text file
  5. Python program to select word randomly from text file and store it in another file.