Code Vs Design

THE SPAGHETTI WAY (Dangerous)

logic is mixed with execution

def buy_stock(symbol, amount): # What if amount is > account_balance? # What if we already bought this 100 times this second? api.execute_order(symbol, amount, “BUY”) print(f”Bought {amount} of {symbol}”)

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THE ARCHITECTED WAY (Safe)

Logic is separated from execution via Design Patterns

class RiskManager: _instance = None # Singleton Pattern

def check_risk(self, amount, balance):
    if amount > balance:
        raise Exception("Risk Alert: Insufficient Funds")
    if self.daily_trade_count > 50:
        raise Exception("Risk Alert: Overtrading Detected")
    return True

class TradingBot: def init(self, budget): self.risk_manager = RiskManager() # Dependency self.balance = budget

def execute_trade(self, symbol, amount):
    # The Code doesn't just "run", it asks for permission first
    try:
        if self.risk_manager.check_risk(amount, self.balance):
            api.execute_order(symbol, amount, "BUY")
            self.balance -= amount
    except Exception as e:
        print(f"Trade Blocked: {e}")

The “Code” is longer, but the “System” is safer.