RLayton Ch4 Ex7 | Python Fiddle

# Software discount calculator
# by Robert Layton

SOFTWARE_PRICE = 99.00		#CONSTANT value for the software price

# FUNCTIONS

# Return a string with the percentage (float value) as a percentage
def percentageString(num, trailingNumbers):
    return str(num*100)[:4 + (trailingNumbers-1)] + '%'

# MAIN PROGRAM
    
# Welcome and prompt user for input
print 'Welcome to the software quantity discount calculator.'
quantity = input('Enter the number of software packages purchased.')

# Intitialize discount variable
discount = 0.0

# Determine discount based on quantity
if (quantity >= 100):
    discount = 0.50
elif (quantity >= 50):
    discount = 0.40
elif (quantity >=20):
    discount = 0.30
elif (quantity >= 10):
    discount = 0.20
    
# Print results
subtotal = quantity * SOFTWARE_PRICE
print '\n ----- RECEIPT ------'
print 'Software purchased:', quantity
print 'Subtotal: $' + "{:,.2f}".format(subtotal) 
print 'Total discount: $' + "{:,.2f}".format(subtotal * discount), '(' +percentageString(discount,2) +')'
print 'Total price: $' + "{:,.2f}".format(subtotal - (subtotal * discount))

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