Member Avatar for butterflyTee

#
# A program that accepts the total amount of purchase, calculates the
# appropriate discount, and displays the discount and the purchase after
# discount.


from math import *

def main():
cost = get_cost()
discount = get_discount()
% = calc_percent(discount)
final cost = get_final_cost
cost_percent = cost_discount(cost, discount)
show_result(cost_discount_final_cost)


def get_cost():
return float(raw_input("Enter the cost before discount: "))


def get_discount():
return float(raw_input("Enter your discount is: "))


def calc_percent(discount)
% = 0.10 on the entire purchase if it exceeds $1,000.00
% = 0.05 on the entire purchase if it exceeds $500.00, but not $1,000.00
print "No discount on puchases of $500.00 or less

:o

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Dani AI

Generated

Good start — the idea is exactly what and pointed out: compute the discount from the purchase total (no need to ask the user for a discount), and use simple conditionals. Below is a compact, more robust pattern that avoids float rounding errors, validates input, and cleanly separates rate calculation from presentation.

from decimal import Decimal, ROUND_HALF_UP

def discount_rate(cost):
    if cost > Decimal('1000.00'):
        return Decimal('0.10')
    if cost > Decimal('500.00'):
        return Decimal('0.05')
    return Decimal('0.00')

def apply_discount(cost):
    rate = discount_rate(cost)
    discount = (cost * rate).quantize(Decimal('0.01'), rounding=ROUND_HALF_UP)
    total = (cost - discount).quantize(Decimal('0.01'), rounding=ROUND_HALF_UP)
    return rate, discount, total
if __name__ == '__main__':
    from decimal import Decimal, InvalidOperation
    while True:
        s = input('Enter purchase amount: ').strip().replace(',', '').replace('$', '')
        try:
            cost = Decimal(s)
            if cost < 0:
                raise ValueError
            break
        except (InvalidOperation, ValueError):
            print('Please enter a non-negative numeric amount, e.g. 1250.75')

    rate, disc, total = apply_discount(cost)
    print(f'Discount rate: {int(rate * 100)}%')
    print(f'Discount amount: ${disc}')
    print(f'Total after discount: ${total}')

Quick tips: use Decimal for money to avoid float surprises; sanitize input (strip commas or $ signs); don’t use % as a variable name; and put logic behind if __name__ == '__main__' so functions can be tested or imported. Expected results: 1200 -> 10% ($120.00 off), 750 -> 5% ($37.50 off), 400 -> no discount.

Recommended Answers

All 4 Replies

Member Avatar for bumsfeld

Since your discount is calculated from the total purchase, you do not need to ask for it.
Discount calculations are done using conditional if statements.

Do not use % as a variable name!

All calculations are simple, no need for "from math import *"

Member Avatar for butterflyTee

can you show me please i tried using using the if statements

Member Avatar for vegaseat

You are almost there, please try to understand the logic here ...

def calc_discount(cost):
    if cost > 1000.00:
        discount = cost * 0.1    # 10%
        return discount
    elif cost > 500.00:
        discount = cost * 0.05   # 5%
        return discount
    else:
        # no discount
        return 0.0

Once you know the cost of the purchase then discount = calc_discount(cost) and your final cost will be cost - discount. Not really rocket science, but very simple algebra!

Member Avatar for butterflyTee

thank you...it helped alot

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