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Your Cofounder Wrote Shipping Logic and It's 7 If-Statements Deep

Your startup just launched a shipping feature. Your cofounder wrote the pricing logic over a weekend, and it works — but it's 7 levels of nested if/else statements deep...

def calculate_shipping(weight, zone, membership, express):
    if weight > 0:
        if zone in ["domestic", "international"]:
            if membership in [...]:
                if express:
                    if zone == "domestic":
                        if weight <= 5:
                            base = 5.99
                        ...