# 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 Students
ls =[]
# an object of Student class
obj = 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 !")