import sqlite3
from datetime import datetime

conn = sqlite3.connect("demo.db")
c = conn.cursor()

c.execute("CREATE TABLE IF NOT EXISTS studenttb(id INTEGER PRIMARY KEY AUTOINCREMENT,name TEXT,age INTEGER,dt TEXT)")
conn.commit()

def insert():
    name = input("Name: ")
    age = int(input("Age: "))
    dt = datetime.now()
    c.execute("INSERT INTO studenttb(name,age,dt) VALUES (?,?,?)",(name,age,dt))
    conn.commit()

def display():
    rows = c.execute("SELECT * FROM studenttb").fetchall()
    for r in rows: print(r)

def update():
    id = int(input("ID: "))
    new_age = int(input("New age: "))
    dt = datetime.now()
    c.execute("UPDATE studenttb SET age=?,dt=? WHERE id=?",(new_age,dt,id))
    conn.commit()

def delete():
    id = int(input("ID: "))
    c.execute("DELETE FROM studenttb WHERE id=?", (id,))
    conn.commit()

while True:
    choice = input("1-Insert 2-Display 3-Update 4-Delete 5-Exit: ")
    if choice=="1": insert()
    elif choice=="2": display()
    elif choice=="3": update()
    elif choice=="4": delete()
    elif choice=="5": break

conn.close()