Error Classification: Syntax error (the Python parser can’t understand the code structure, so it fails before running anything). Root Cause Explanation: Python’s for loop statement has a required syntax shape: for <variable> in <iterable>: In your code, the line is: for i in range(len(numbers)) It’s missing the colon : at the end. The colon tells Python, “the indented block below belongs to this loop.” When Python reaches the end of that line, it’s still expecting : to start the loop body, so it raises: SyntaxError: expected ':' Minimal Fix: Add a colon : at the end of the for line. Corrected Code Snippet: Python for i in range(len(numbers)): print(numbers[i]) Prevention Tip: Build a quick “loop checklist” habit: Does the loop header end with :? Is the loop body indented consistently (usually 4 spaces)? If you use an editor/IDE with Python support, it will often auto-insert the colon or highlight the line immediately when it’s missing. Reflection Question: In Python, what does the : specifically communicate about the code that follows (especially in relation to indentation)?