Update app.py

app.py

@@ -37,10 +37,14 @@ with st.sidebar.expander("Asset Settings", expanded=True):
     start_date = st.date_input("Start Date", value=datetime(2015, 1, 1), help="Select the start date for historical data.")
     end_date = st.date_input("End Date", value=datetime.today() + timedelta(days=1), help="Select the end date for historical data.")
 
-# Function to download data
+# Function to download data with yfinance adjustments
 @st.cache_data
 def download_data(ticker, start, end):
-    data = yf.download(ticker, start=start, end=end)
+    data = yf.download(ticker, start=start, end=end, auto_adjust=False)
+    if isinstance(data.columns, pd.MultiIndex):
+        data.columns = data.columns.get_level_values(0)
+    if data.empty:
+        raise ValueError(f"No data fetched for {ticker} from {start} to {end}.")
     return data
 
 # Function to calculate moving averages
@@ -91,7 +95,6 @@ def execute_strategy(data, short_window, medium_window, long_window, threshold,
     data = calculate_equity_curve(data)
     return data
 
-# Function to plot results
 # Function to plot results with subplots for better alignment
 def plot_results(data, params, title_suffix):
     # Create subplots: 2 rows (Price + MA, and Equity Curve), shared x-axis for alignment