main.py

import pickle as p

def create():
    n = int(input("Enter no of records: "))
    f = open('Attendance.dat', 'wb')

    for k in range(n):
        name = input("Enter name: ")
        admn = int(input("Enter admn no: "))
        ndp = int(input("Enter no of present days: "))
        tdp = 200 #Setting no of working days to a default value as total no of working days does not change
        # tdp = int(input("Enter total no of days")) # Not necessary when setting a default value

        L = [name, admn, ndp, tdp]

        p.dump(L, f)

    f.close()
    print("File Created")

def tabular():
    f = open("Attendance.dat", 'rb')
    print("{:<20}".format("Name"), "{:<20}".format("Admno"), "{:<20}".format("No of working days"), "{:<20}".format("Total working days"))

    while True:
        try:
            A = p.load(f)

            for k in A:
                print("{:<20}".format(k), end=" ")
            print()

        except EOFError:
            break

    f.close()

def detail75():
    f = open('Attendance.dat', 'rb')
    print("{:<20}".format("Name"), "{:<20}".format("Admno"), "{:<20}".format("No of working days"), "{:<20}".format("Total working days"))

    while True:
        try:
            A = p.load(f)

            per = (A[2]/A[3]) * 100

            if per < 75:
                for k in A:
                    print("{:<20}".format(k), end=" ")
                print()
        except EOFError:
            break

    f.close()

def count75():
    f = open("Attendance.dat", 'rb')
    count = 0

    while True:
        try:
            A = p.load(f)

            per = (A[2]/A[3]) * 100

            if per > 75:
                count = count + 1
        except EOFError:
            break

    f.close()
    print("No of students with more than 75% attendance: ",count)

while True:
    print("\t\t\t1. Create a binary file")
    print("\t\t\t2. Display the content in tabular form")
    print("\t\t\t3. Display the details of the student whose attendace is below 75%")
    print("\t\t\t4. Display the total no of students whose attendance is above 75%")
    print("\t\t\t5. Kill the program")

    ch = int(input("\t\t\tEnter your selection: "))

    if ch == 1:
        create()

    elif ch == 2:
        tabular()

    elif ch == 3:
        detail75()

    elif ch == 4:
        count75()

    elif ch == 5:
        print("Thank you for using me")
        break

    else:
        print("Invalid option, Please try again")