Encapsulation

class BankAccount:
	def __init__(self,balance):
		self.__balance=balance
	def deposit(self,amount):
		self.__balance+=amount
	def get_balance(self):
		return self.__balance
account=BankAccount(1000)
account.deposit(500)
print(account.get_balance())

account.__balance wont run because adding __ will make it private.