Get the real-time quote for a single A-share stock.

Args: symbol: A 6-digit A-share code, e.g. "600519" (Kweichow Moutai) or "300750" (CATL).

Returns: A dict with the latest price, change percentage, volume, turnover and market-cap figures. On failure, a dict with an error key explaining what went wrong.

Example: >>> get_stock_quote("600519") # doctest: +SKIP {'symbol': '600519', 'name': '贵州茅台', 'price': 1683.0, 'change_pct': 0.85, 'volume': 31250, 'total_market_cap': 2.1e12, ...}

Get key financial-statement line items for an A-share company.

Args: symbol: A 6-digit A-share code, e.g. "600519". period: "annual" for the latest fiscal-year report (default), or "quarterly" for the most recent quarterly report.

Returns: A dict with the latest income_statement, balance_sheet and cash_flow key items (values in CNY), plus the report_date they were drawn from. On failure, a dict with an error key.

Example: >>> get_financial_statements("600519", "annual") # doctest: +SKIP {'symbol': '600519', 'period': 'annual', 'report_date': '2023-12-31', 'income_statement': {'total_revenue': 1.5e11, 'net_profit': 7.4e10, ...}, 'balance_sheet': {...}, 'cash_flow': {...}}

Get recent news headlines for an industry or theme.

Args: industry: An industry/theme keyword in Chinese, e.g. "光伏" (photovoltaics) or "新能源车" (electric vehicles). days: Look-back window in days (default 7, capped at 30). Items older than this are dropped.

Returns: A dict with the query echoed back and an articles list, each item carrying title, source, published_at and url. On failure, a dict with an error key.

Example: >>> get_industry_news("光伏", days=7) # doctest: +SKIP {'industry': '光伏', 'days': 7, 'count': 12, 'articles': [{'title': '...', 'source': '...', 'published_at': '2024-01-15 10:30:00', 'url': '...'}, ...]}