The Python Tutorial, Python Software Foundation, 2023 - Official and comprehensive introduction to Python's core features, including basic data types, control flow, and functions.
Introduction to Computer Science and Programming in Python, Ana Bell, Eric Grimson, and John Guttag, 2016 (MIT OpenCourseWare) - An introductory university-level course providing a structured approach to Python fundamentals, including data types, control flow, and functions.