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Lab 05
20 mins

Python Logic and Debugging Lab

Mission Briefing

Investigate a CSV-cleaning routine through read-only code cards. Predict variables, order statements, and fix algorithmic bugs.

Success Criteria
  • Complete scenario tasks and verify feedback.
Interactive Sandbox Guardrails
Syntax Card ViewerExecution TracerVariable TableFlowchart Visualizer

Deterministic browser simulation with server-authoritative scoring. Zero setup required.

Execution RuntimeAuthored Python Trace FramesStrict sandbox (No runtime eval)
Current Trace FrameStep 1 / 5Initialize cleaned_rows list
Algorithmic BoundaryFixed (range(len(rows)))0-Indexed Python list safety
clean_csv_records.py (Read-Only Syntax Cards)Authored Snippet
1: cleaned_rows = []
2: rows = ["Acme Corp", "Beta LLC", "Gamma Inc"]
3: # BUG: range(len(rows) + 1) causes index 3 out of bounds!
4: for i in range(len(rows)):
5: cleaned_rows.append(rows[i].strip())
6: return cleaned_rows

Variable State Inspector at Step 1

i (loop index)undefined
total processed0
cleaned_rows[]

Algorithmic Diagnosis & Patch

Intelligent Adaptive Discovery

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