Prerequisite Check

This checks an earlier skill, before the new module terminology. Write an explanation and a small example without opening the answer. This is a repair decision, not a timed entrance exam.

Entry task

A function used to return None for a miss and now raises. Explain why its successful examples do not establish backward compatibility.

Retain your initial attempt, then consult prerequisite calibration. If the explanation or example is incomplete, follow that repair route and repeat with new values before the dependent lesson. A correct label without the trace is not sufficient. Ask for help when the repair is unclear and record that help honestly.

Continue with the module's concept sequence, then independent practice. The former entry questions about this module's own content remain a preview on the module page; they do not establish prerequisites.