Feb, Python - rextester

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# change 50 to the price of your cart
price = 100.00

from random import randint

# to update with new coupons search codes on community wiki
# in the below list all X off Y+ purchases with their 4 digit codes
# (x, y) refers to an $X off $Y+ purchase
# (x, 0) refers to a x% off entire pruchase
CODES = {
    (10, 50) : "1530"
    ,(20, 100) : "2379"
     ,(10, 0): "2377"
}

# define coupons

def applycoupon(i, j, price):
    """apply coupons"""
    price = 1.0*price
    if (i, j) in CODES:
        if j==0:
            return (1-(i/100.0))*price, CODES[(i, j)]
        elif price >= j:
            return price - i, CODES[(i, j)]
        else:
            return price, CODES[(i, j)]
    else:
        return price, "code not in dict"

def min_price_w_coupon(cartprice):
    """check the best coupon to apply to a cart"""
    p_w_coupon = cartprice
    code = "no applicable coupon"
    for key in CODES:
        i = key[0]
        j = key[1]
        test_coup = applycoupon(i, j, cartprice)
        test_coup_price = test_coup[0]
        test_coup_code = test_coup[1]
        if test_coup_price < p_w_coupon:
            p_w_coupon = test_coup_price
            code = test_coup_code
    return p_w_coupon, code

def addcheckdigit(stuff):
    checkdigit = 0
    for j in range(14):
        if j % 2 == 0:
            checkdigit += int(stuff[j])
        else:
            checkdigit += int(stuff[j]) * 3
    print(str(stuff) ) + str((10 -(checkdigit % 10))%10)

def coupon_generator(price):
    if min_price_w_coupon(price)[1]  == "no applicable coupon" or min_price_w_coupon(price)[1]  == "code not in dict":
        print("no applicable coupon")
    else:
        for j in range(20):
            i = randint(0, 999999)
            addcheckdigit("4750" + "%04d" % i + min_price_w_coupon(price)[1])

coupon_generator(price)

[ + ] Show input
Absolute running time: 31.16 sec, cpu time: 0 sec, memory peak: 0 Mb, absolute service time: 40,05 sec