Stuff

import math

def calcPrice (zone,x):
    if zone == 1:
        price = x * 1
    elif zone == 2:
        price = x * 0.8
    elif zone == 3:
        price = x * 0.5
    else:
        print zone,' is not a valid zone. Please try again'
        return 0

    return price


def insertCoin (price):
    coin = float(raw_input('Please insert coin : '))

    if coin == 0.10 or coin == 0.20 or coin == 0.50 or coin == 1 or coin == 2 or coin == 5 :
        if price > coin:
            price = price - coin
            print 'You have to insert more coins. New price is : ', price
            return insertCoin (price)
        elif price < coin:
            exchange = coin - price
            print 'Exchange is ',exchange
            printExchange(exchange);
        else:
            print 'Thank You!!'
            return 0
    else:
        print coin ,'is not accepted'
        print 'Accepted coins : 0.10 , 0.20 , 0.50 , 1 , 2 and 5 Euros'
        return insertCoin(price)


def printExchange (exchange):
    changes = [ 0, 0, 0, 0, 0, 0 ]

    while exchange != 0:
        if exchange == 5:
            changes [0] += 1
            exchange = exchange - 5
        elif exchange >= 2:
            changes [1] +=1
            exchange = exchange - 2
        elif exchange >= 1:
            changes [2] +=1 
            exchange = exchange - 1
        elif exchange >= 0.50:
            changes [3] +=1
            exchange = exchange - 0.5
        
        elif exchange >= 0.20:
            changes [4] +=1
            exchange = exchange - 0.2
            
        elif exchange >= 0.10:
            changes [5] +=1
            exchange = exchange - 0.1
         
    print 'You will have back',
    if changes[0]!=0 :
           print changes[0],'coins of 5 Euro',
    if changes [1]!= 0:
        print changes[1],'coints of 2 Euro',
    if changes [2] != 0:
        print changes [2],'coins of 1 Euro',
    if changes [3] != 0 :
        print changes [3],'coins of 0.5 Euro',
    if changes [4] !=0:
        print changes [4],'coins of 0.2 Euro',
    if changes [5] !=0:
        print changes [5],'coins of 0.1 Euro'
    print 'Thank You and have a nice day!'
    return 0

        
print 'Please give ticket type :'
print '1 for 1rst zone'
print '2 for 2nd zone'
print '3 for 3rd zone'
zone = int(raw_input('Your choice : '))
x = int(raw_input('Please give amount of tickets : '))
price = calcPrice (zone,x)
print 'The total cost is : ',price
insertCoin (price)