Learn how to create NumPy arrays from existing data using three powerful functions: asarray(), frombuffer(), and fromiter(). This 30-minute tutorial explores the intricacies of working with arrays containing pre-existing data in Python programming. Discover how to efficiently convert various input types into NumPy arrays, manipulate buffer objects, and transform iterables into array structures. Master these essential techniques to enhance your data manipulation skills and streamline your NumPy workflows.