What are we replacing?

Understanding string replacement methods in Python

This is an easy Python question that tests your familiarity with string manipulation—specifically, how the replace() method behaves and what it returns. It is the kind of foundational question used to verify that candidates have hands-on experience with Python's standard library and can trace code execution accurately.

To answer correctly, you need to understand how replace() processes a string, what arguments it accepts, and how it handles edge cases like overlapping patterns or multiple occurrences. The question rewards careful reading of the code and a clear mental model of method semantics.

• String immutability in Python
• Method chaining and return values
• Pattern matching and substitution rules