Avoid random "free PDF download" sites that ask for credit cards or require you to disable your antivirus. Many of these files contain malware or are simply scanned copies of the 2015 edition with "Python" photoshopped onto the cover.
Learning Python syntax is straightforward. Python is famous for its clean, readable code that feels close to English. However, many beginners hit a wall immediately after learning variables, loops, and functions. They open a blank file, face a new problem, and have no idea how to start writing code.
Think Like a Programmer Python Edition PDF: A Practical Guide to Mastering Problem Solving
The end-of-chapter challenges are where the real learning happens. Do not skip them.