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#!/usr/bin/python

class InvoiceItem:

'''An item within the invoice'''

def __str__(self):

return self.text + ' ' + str(self.amt)

def __init__(self, **kwargs):

self.text = ''

self.amt = 0

if kwargs['text'] != None:

self.text = kwargs['text']

if kwargs['amt'] != None:

self.amt = kwargs['amt']

class Invoice:

# This is a static variable

my_company_name = "DIYComputerScience"

# This is a static method

@staticmethod

def get_service_tax_per():

return 12.5

'''An invoice.'''

def __str__(self):

return self.number + ' ' + str(self.amt())

def __init__(self, **kwargs):

self.number = ''

self.client = ''

self.date = ''

self.invoice_items = []

def add_invoice_item(self, invoice_entry):

self.invoice_items.append(invoice_entry)

def amt(self):

amt = 0

for item in self.invoice_items:

amt = amt + item.amt

return amt

invoice = Invoice()

invoice.number = '20080422_01'

invoice.client = 'Sun Microsystems'

invoice.date = '22/04/2008'

invoice_item = InvoiceItem(text='consulting April', amt=2000)

invoice.add_invoice_item(invoice_item)

print invoice