Debugging and Root Cause Fixing

Core Philosophy

Find and fix the root cause. NEVER work around problems with wrappers or complexity.

Debugging Workflow

1. Read the Stack Trace

# Stack traces read bottom-to-top. The last frame is where error occurred.
Traceback (most recent call last):
  File "main.py", line 10, in <module>      # Entry point
    result = process_data(data)              # Calling function
  File "processor.py", line 25, in process_data
    return transform(item)                   # Where it failed
TypeError: 'NoneType' has no attribute 'items'  # What went wrong