Update notebooks/01-getting-started.ipynb

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: Satvik-Singh192

notebooks/01-getting-started.ipynb

@@ -388,7 +388,7 @@
     "# Backtest\n",
     "common = prices.index.intersection(signals.index)\n",
     "px = prices.loc[common]\n",
-    "sg = pd.DataFrame(dict.fromkeys(px.columns, signals['composite']), index=signals.index).loc[common]\n",
+    "sg = pd.DataFrame({c: signals['composite'] for c in px.columns}, index=signals.index).loc[common]\n",
     "\n",
     "bt = VectorizedBacktest(px, sg, initial_capital=100000)\n",
     "results = bt.run(weight_scheme=\"rank\")\n",