Reading Someone Else's Python Code

Unfamiliar code does not need to stay unfamiliar. This Block shows you how to turn a new Python script into a few manageable questions: what goes in, what runs first, which values change, and what comes out. You will learn to scan names and structure, locate the top-level flow, follow function calls and loops, and compare predictions with the program's real behavior.

What you will learn:

• Scan names and code structure before reading every line
• Find the top-level starting point and follow execution in order
• Identify inputs, returned values, printed output, and other visible changes
• Trace function calls, conditions, loops, and values that change
• Use small predictions, focused debug output, and tiny reproductions when stuck
• Make focused changes safely and verify boundary cases

Finish with a repeatable reading routine that helps you understand unfamiliar code without rushing to rewrite it.