Improve market data fetching routines.

yfinance_test.py

@@ -0,0 +1,50 @@
+# yfinance_test.py
+# A standalone script to diagnose the persistent yfinance issue.
+
+import yfinance as yf
+import logging
+
+# Set up a simple logger to see detailed error tracebacks
+logging.basicConfig(
+    level=logging.INFO,
+    format='%(asctime)s - %(levelname)s - %(message)s'
+)
+
+# A list of tickers to test. One very common one, and two from your logs.
+TICKERS_TO_TEST = ["MSFT", "AEBI", "AEHR"]
+
+print("--- Starting YFINANCE Diagnostic Test ---")
+
+for ticker_symbol in TICKERS_TO_TEST:
+    print(f"\n--- Testing Ticker: {ticker_symbol} ---")
+
+    # --- Test 1: The Ticker().info method ---
+    try:
+        logging.info(f"Attempting to create Ticker object and get .info for {ticker_symbol}...")
+        ticker_obj = yf.Ticker(ticker_symbol)
+        market_cap = ticker_obj.info.get('marketCap')
+        if market_cap is not None:
+            logging.info(f"SUCCESS: Got market cap for {ticker_symbol}: {market_cap}")
+        else:
+            logging.warning(f"PARTIAL SUCCESS: .info call for {ticker_symbol} worked, but no market cap was found.")
+    except Exception:
+        logging.error(f"FAILURE: An error occurred during the Ticker().info call for {ticker_symbol}.", exc_info=True)
+
+
+    # --- Test 2: The yf.download() method ---
+    try:
+        logging.info(f"Attempting yf.download() for {ticker_symbol}...")
+        data = yf.download(
+            ticker_symbol,
+            period="2d",
+            progress=False,
+            auto_adjust=False
+        )
+        if not data.empty:
+            logging.info(f"SUCCESS: yf.download() for {ticker_symbol} returned {len(data)} rows of data.")
+        else:
+            logging.warning(f"PARTIAL SUCCESS: yf.download() for {ticker_symbol} worked, but returned no data (likely delisted).")
+    except Exception:
+        logging.error(f"FAILURE: An error occurred during the yf.download() call for {ticker_symbol}.", exc_info=True)
+
+print("\n--- YFINANCE Diagnostic Test Complete ---")