# Student management system in Python # This is simplest Student data management program in python# Create class "Student"class Student:    # Constructor    def __init__(self, name, rollno, m1, m2):        self.name = name        self.rollno = rollno        self.m1 = m1        self.m2 = m2             # Function to create and append new student       def accept(self, Name, Rollno, marks1, marks2 ):        # use  ' int(input()) ' method to take input from user        ob = Student(Name, Rollno, marks1, marks2 )        ls.append(ob)      # Function to display student details         def display(self, ob):            print("Name   : ", ob.name)            print("RollNo : ", ob.rollno)            print("Marks1 : ", ob.m1)            print("Marks2 : ", ob.m2)            print("\n")                 # Search Function        def search(self, rn):        for i in range(ls.__len__()):            if(ls[i].rollno == rn):                return i             # Delete Function                                      def delete(self, rn):        i = obj.search(rn)          del ls[i]      # Update Function       def update(self, rn, No):        i = obj.search(rn)        roll = No        ls[i].rollno = roll;         # Create a list to add Studentsls =[]# an object of Student classobj = Student('', 0, 0, 0)  print("\nOperations used, ")print("\n1.Accept Student details\n2.Display Student Details\n" /      / "3.Search Details of a Student\n4.Delete Details of Student" /      / "\n5.Update Student Details\n6.Exit")  # ch = int(input("Enter choice:"))# if(ch == 1):obj.accept("A", 1, 100, 100)obj.accept("B", 2, 90, 90)obj.accept("C", 3, 80, 80)         # elif(ch == 2):print("\n")print("\nList of Students\n")for i in range(ls.__len__()):        obj.display(ls[i])             # elif(ch == 3):print("\n Student Found, ")s = obj.search(2)obj.display(ls[s])         # elif(ch == 4):obj.delete(2)print(ls.__len__())print("List after deletion")for i in range(ls.__len__()):        obj.display(ls[i])             # elif(ch == 5):obj.update(3, 2)print(ls.__len__())print("List after updation")for i in range(ls.__len__()):        obj.display(ls[i])             # else:print("Thank You !")    