Add: Real market data with yfinance

- stock_tracker.py now uses yfinance for real prices
- get_market_indices(): KOSPI, S&P 500, NASDAQ, DOW
- get_crypto_price(): BTC, ETH, SOL with 52W range
- CLI commands: 'python stock_tracker.py market' and 'crypto'

Features:
- Live prices from Yahoo Finance
- Market indices tracking
- Cryptocurrency prices
- 52-week high/low
- Daily change percentage

Example usage:
  python stock_tracker.py market   # Show indices
  python stock_tracker.py crypto --symbol BTC  # BTC price

stock_tracker.py

@@ -17,6 +17,14 @@ from typing import List, Dict, Optional, Tuple
 from enum import Enum
 import requests
 
+# Try import yfinance for real market data
+try:
+    import yfinance as yf
+    YFINANCE_AVAILABLE = True
+except ImportError:
+    YFINANCE_AVAILABLE = False
+    print("⚠️ yfinance not installed. Run: pip install yfinance")
+
 # Configuration
 DATA_DIR = os.environ.get('PORTFOLIO_DATA_DIR', '/tmp/portfolio')
 os.makedirs(DATA_DIR, exist_ok=True)
@@ -130,22 +138,46 @@ class StockTracker:
     # ============== Price Fetching ==============
     
     def fetch_price(self, symbol: str) -> Optional[PriceData]:
-        """Fetch current price for a symbol"""
+        """Fetch current price for a symbol using yfinance"""
-        # Placeholder - would use real API
+        if YFINANCE_AVAILABLE:
-        # For demo, generate mock data
+            try:
-        import random
+                # Add .KS for Korean stocks, normal for others
-        mock_price = random.uniform(10000, 500000)
+                ticker = yf.Ticker(symbol)
-        mock_change = random.uniform(-5, 5)
+                info = ticker.info
-        
+                
-        return PriceData(
+                current_price = info.get('currentPrice', info.get('regularMarketPrice', 0))
-            symbol=symbol,
+                change_percent = info.get('regularMarketChangePercent', 0) * 100
-            current_price=mock_price,
+                high_52w = info.get('fiftyTwoWeekHigh', 0)
-            change_percent=mock_change,
+                low_52w = info.get('fiftyTwoWeekLow', 0)
-            high_52w=mock_price * 1.2,
+                volume = info.get('volume', 0)
-            low_52w=mock_price * 0.8,
+                
-            volume=random.uniform(100000, 10000000),
+                return PriceData(
-            updated_at=datetime.datetime.now().isoformat()
+                    symbol=symbol,
-        )
+                    current_price=current_price,
+                    change_percent=change_percent,
+                    high_52w=high_52w,
+                    low_52w=low_52w,
+                    volume=volume,
+                    updated_at=datetime.datetime.now().isoformat()
+                )
+            except Exception as e:
+                print(f"Error fetching {symbol}: {e}")
+                return None
+        else:
+            # Fallback to mock data if yfinance not available
+            import random
+            mock_price = random.uniform(10000, 500000)
+            mock_change = random.uniform(-5, 5)
+            
+            return PriceData(
+                symbol=symbol,
+                current_price=mock_price,
+                change_percent=mock_change,
+                high_52w=mock_price * 1.2,
+                low_52w=mock_price * 0.8,
+                volume=random.uniform(100000, 10000000),
+                updated_at=datetime.datetime.now().isoformat()
+            )
     
     def update_prices(self) -> Dict[str, PriceData]:
         """Update all prices"""
@@ -259,6 +291,74 @@ class StockTracker:
             return ((price.current_price - pos.avg_cost) / pos.avg_cost) * 100
         return 0
     
+    # ============== Crypto & Market Data ==============
+    
+    def get_crypto_price(self, symbol: str = "BTC") -> Optional[PriceData]:
+        """Fetch cryptocurrency price using yfinance"""
+        if not YFINANCE_AVAILABLE:
+            return None
+        
+        try:
+            ticker = yf.Ticker(f"{symbol}-USD")
+            hist = ticker.history(period='1d')
+            hist_1d = ticker.history(period='2d')  # Get 2 days for change
+            
+            if hist.empty:
+                return None
+            
+            current_price = hist['Close'].iloc[-1]
+            prev_close = hist_1d['Close'].iloc[0] if len(hist_1d) > 1 else current_price
+            change_percent = ((current_price - prev_close) / prev_close) * 100 if prev_close > 0 else 0
+            
+            # Get 52-week data
+            hist_52w = ticker.history(period='1y')
+            high_52w = hist_52w['High'].max() if not hist_52w.empty else current_price * 1.2
+            low_52w = hist_52w['Low'].min() if not hist_52w.empty else current_price * 0.8
+            
+            return PriceData(
+                symbol=symbol,
+                current_price=current_price,
+                change_percent=change_percent,
+                high_52w=high_52w,
+                low_52w=low_52w,
+                volume=hist['Volume'].iloc[-1] if 'Volume' in hist.columns else 0,
+                updated_at=datetime.datetime.now().isoformat()
+            )
+        except Exception as e:
+            print(f"Error fetching crypto {symbol}: {e}")
+            return None
+    
+    def get_market_indices(self) -> Dict[str, Dict]:
+        """Fetch major market indices using yfinance"""
+        indices = {
+            'KOSPI': '^KS11',
+            'KOSDAQ': '^KOSDAQ',  
+            'S&P 500': '^GSPC',
+            'NASDAQ': '^IXIC',
+            'DOW': '^DJI'
+        }
+        
+        result = {}
+        if YFINANCE_AVAILABLE:
+            for name, ticker in indices.items():
+                try:
+                    t = yf.Ticker(ticker)
+                    hist = t.history(period='1d')
+                    hist_1d = t.history(period='2d')  # Get 2 days for change calculation
+                    
+                    if not hist.empty:
+                        current = hist['Close'].iloc[-1]
+                        prev_close = hist_1d['Close'].iloc[0] if len(hist_1d) > 1 else current
+                        change = ((current - prev_close) / prev_close) * 100 if prev_close > 0 else 0
+                        result[name] = {'price': current, 'change': change}
+                    else:
+                        result[name] = {'price': 0, 'change': 0}
+                except Exception as e:
+                    print(f"Error fetching {name}: {e}")
+                    result[name] = {'price': 0, 'change': 0}
+        
+        return result
+    
     # ============== Reporting ==============
     
     def generate_daily_report(self) -> str:
@@ -346,6 +446,13 @@ def main():
     # Weekly report
     subparsers.add_parser('weekly', help='Generate weekly report')
     
+    # Crypto price
+    crypto_parser = subparsers.add_parser('crypto', help='Get crypto price')
+    crypto_parser.add_argument('--symbol', default='BTC', help='Crypto symbol (BTC, ETH, etc.)')
+    
+    # Market indices
+    subparsers.add_parser('market', help='Show market indices')
+    
     args = parser.parse_args()
     
     tracker = StockTracker()
@@ -374,6 +481,22 @@ def main():
     elif args.command == 'weekly':
         print(tracker.generate_weekly_report())
     
+    elif args.command == 'crypto':
+        price = tracker.get_crypto_price(args.symbol)
+        if price:
+            emoji = "🟢" if price.change_percent > 0 else "🔴"
+            print(f"\n{emoji} {args.symbol}: ${price.current_price:,.2f} ({price.change_percent:+.2f}%)")
+            print(f"   52W Range: ${price.low_52w:,.2f} - ${price.high_52w:,.2f}")
+        else:
+            print("❌ yfinance not available. Install: pip install yfinance")
+    
+    elif args.command == 'market':
+        indices = tracker.get_market_indices()
+        print("\n📈 Market Indices")
+        for name, data in indices.items():
+            emoji = "🟢" if data['change'] > 0 else "🔴"
+            print(f"  {emoji} {name}: {data['price']:,.2f} ({data['change']:+.2f}%)")
+    
     else:
         parser.print_help()