[StackOverflow/python] How to fix “ '" is not a valid UUID.”

### ROOT CAUSE The issue arises because the input string contains non-hexadecimal characters (e.g., `'`, `"`), which are invalid in a UUID. UUIDs are strictly 32-character hexadecimal strings (or with hyphens), so any extra characters or formatting breaks the validation. ### CODE FIX Validate the UUID string before use. Here's a robust solution using Python's `uuid` module to check UUID format: ```python import uuid def is_valid_uuid(uuid_str): try: uuid.UUID(uuid_str) return True except ValueError: return False # Example usage: test_uuid = "your_uuid_string_here" if is_valid_uuid(test_uuid): print("Valid UUID") else: print("Invalid UUID") ``` **Explanation**: - The `uuid.UUID()` constructor strictly validates UUID strings. If the string is invalid (e.g., contains non-hex characters), it raises a `ValueError`. - Use `is_valid_uuid()` to sanitize input before processing, ensuring no invalid UUIDs are passed to critical operations.