In our last two sessions, we built a real-time price alert system from scratch and wrote your first automated trading script. Now we tackle

In our last two sessions, we built a real-time price alert system from scratch and wrote your first automated trading script. Now we tackle the most critical step before you let any strategy near live capital: backtesting.A good backtest tells you whether your edge is real or just data mining noise. A bad backtest will make you believe you have found the holy grail - right up until the market takes it back.Why vectorization mattersIf you are looping through every row of OHLC data with a for loop, you are doing it wrong. Pandas vectorized operations are not just faster...