How to Simulate a Portfolio in Python

What happens if you invest in 3 stocks?
Let’s simulate it with random returns:

import numpy as np

portfolio = {
    "AAPL": 0.4,
    "MSFT": 0.3,
    "TSLA": 0.3
}

np.random.seed(0)
returns = {ticker: np.random.normal(0.01, 0.03, 12) for ticker in portfolio}

total = 1000
for i in range(12):  # 12 months
    monthly_return = sum(returns[ticker][i] * weight for ticker, weight in portfolio.items())
    total *= (1 + monthly_return)

print(f"Portfolio value after 1 year: ${round(total, 2)}")

👉 Simulates realistic volatility
🎯 Add in a plot for bonus ✨