PYTHON

I really don't know about you but I definitely struggled with python but with a little help from a few of my fellow students I managed to get through it ok.

Can anyone help me understand whats going on here:

def ATM():

           

    pin = '2580'

    balance = 3500

    overdraft = 250

    while True:

        pin_input = raw_input('insert your PIN number: ')

        if pin == pin_input:

            print 'select from the following options:'

            print

            break

        else:

            print 'wrong pin, try again'

            print

           

    while True:

        menu_input = raw_input('\n1. Balance \n2. Withdraw \n3. Deposit \n4. Exit \nchoose from menu: ')

        if menu_input == '1':

            print '\nAvailable withdraw: ' + str(balance + overdraft)

            print '\nYour overdraft limit is: ' + str(overdraft)

           

        elif menu_input == '2':

            Withdraw_input = raw_input('insert the amount you would like to take out: ')

            if (int(Withdraw_input) > balance + overdraft):

                print 'you are beyond your balance limit'

               

            else:

                print 'withdrawn: ' + str(Withdraw_input)

                if (int(Withdraw_input) > balance):

                    overdraft == overdraft_2

                    overdraft_2 = overdraft - (int(Withdraw_input) - balance)

                balance = (balance + overdraft)- int(Withdraw_input)

                          

  

        elif menu_input == '3':

            Deposit_input = raw_input('enter the  deposit: ')

            print 'The deposited is: ' + str(Deposit_input)

            balance = balance + int(Deposit_input)

           

        elif menu_input == '4':

            print '\n Thank You for using our service'

            break

ATM ()

Youtube (2012). Python For Beginners: http://www.youtube.com/watch?v=29mq1Bn52GY
:)

Here is a video for those who are beginners like me