Add example projects

examples/complex_project/utils.py

@@ -0,0 +1,57 @@
+"""Utility functions."""
+
+from typing import List, TypeVar, Callable
+import json
+
+T = TypeVar('T')
+
+
+def validate_input(data: dict, required_fields: List[str]) -> bool:
+    """Validate that all required fields are present."""
+    for field in required_fields:
+        if field not in data:
+            return False
+    return True
+
+
+def parse_json_safe(json_string: str, default: T = None) -> T:
+    """Safely parse JSON string."""
+    try:
+        return json.loads(json_string)
+    except (json.JSONDecodeError, TypeError):
+        return default
+
+
+def retry_operation(func: Callable, max_retries: int = 3, delay: float = 1.0):
+    """Retry an operation with exponential backoff."""
+    import time
+
+    for attempt in range(max_retries):
+        try:
+            return func()
+        except Exception as e:
+            if attempt == max_retries - 1:
+                raise e
+
+            time.sleep(delay * (2 ** attempt))
+
+    return None
+
+
+class Logger:
+    """Simple logger utility."""
+
+    def __init__(self, name: str):
+        self.name = name
+
+    def info(self, message: str) -> None:
+        """Log info message."""
+        print(f"[INFO] [{self.name}] {message}")
+
+    def error(self, message: str) -> None:
+        """Log error message."""
+        print(f"[ERROR] [{self.name}] {message}")
+
+    def debug(self, message: str) -> None:
+        """Log debug message."""
+        print(f"[DEBUG] [{self.name}] {message}")