Abstraction:
============
==> Abstraction is the fundamental concept in OOP.
==> It is the process of showing the essential data and hiding of the unessential data is called "Abstraction".

Ex:
class MyClass:
	def m1():
		# implementation not important
		# hide
	def m2():
		# implementation

class MyClass1(MyClass):
	def m1():
		implementation1

class MyClass2(MyClass):
	def m1():
		implementation2

==> To implement the abstraction:
	module: abc module

from abc import ABC, abstractmethod

# here: abc ==> module name
# ABC ==> Abstract Class

class Vehicle(ABC):
    @abstractmethod
    def start_engine(self):
        pass

    @abstractmethod
    def stop_engine(self):
        pass

    @abstractmethod
    def drive(self):
        pass

    def greets(self):
        print("Welcome.")

class Car(Vehicle):
    def stop_engine(self):
        print("Car engine stopped...")

    def start_engine(self):
        print("Car engine started...")

    def drive(self):
        print("Car is driving...")
#
class BiCycle(Vehicle):
    def start_engine(self):
        print("Bicycle Engine started...")

    def stop_engine(self):
        print("Bicycle Engine stopped...")

    def drive(self):
        print("Bicycle is driving...")

# vh = Vehicle()
#
# vh.drive()

car = Car()
car.drive()
car.greets()


by = BiCycle()
by.start_engine()
by.greets()

Benefits:
=========
1) Code maintainability is easy.
2) Flexibility
3) Simplification
4) Security
========================================================
class Employee:
    def __init__(self,name, age, position):
        self.name = name
        self.age = age
        self.position = position

    def __str__(self):
        return f"{self.name},{self.age},{self.position}"

class EmployeeManager:
    def __init__(self):
        self.employees = []

    def addEmployee(self,name,age, position):
        employee = Employee(name,age,position)
        self.employees.append(employee)

    def displayEmployees(self):
        if not self.employees:
            print("No Employees found..")
        for emp in self.employees:
            print(emp)
    def findByPosition(self,position):
        found = [emp for emp in self.employees if emp.position == position]

        if found:
            for i in found:
                print(i)
        else:
            print("No employees found.")

    def deleteEmployee(self,name):
        for emp in self.employees:
            if emp.name == name:
                self.employees.remove(emp)
                print(f"Deleted {name}'s record.")
                return
        print(f"Employee {name} not found.")

manager = EmployeeManager()
manager.addEmployee("Harshitha",24,"Software Associate Engineer")
manager.addEmployee("Bhavadeep",22,"Automation Test Engineer")
manager.addEmployee("Charitha",26,"Software Engineer")

print("EMployee List:")
manager.displayEmployees()
print("================================")

print("Finding Employee:")
manager.findByPosition("Software Engineer")

print("============================================")
print("Deleting EMployee...")
manager.deleteEmployee("Ravi")
=================================================================
Python Debugging:
=================
Debugging in python involves identifying, diagnosing and fixing bugs in the program.