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Reading Python Stack Traces

Error Handling

Tracebacks 101

Stack traces show the call stack when an exception occurs. Learn how to read them and extract next steps.

Break down a tracebackLog stack traces

Example​

Traceback (most recent call last):
  File "main.py", line 14, in <module>
    process()
  File "main.py", line 8, in process
    return total / count
ZeroDivisionError: division by zero
  • Read from bottom up to find the root exception.
  • Work backward through the call stack to find the offending line.

Logging​

Use traceback.print_exc() or logger.exception() to capture stack traces when handling errors. Include request IDs or user IDs for faster debugging.

Next up in your learning path

Common error fixes

Look up the exact exception you saw.

Reference

Custom exceptions

Raise descriptive errors to improve tracebacks.

Design

Debugging fundamentals

Pair stack traces with pdb or IDE debuggers.

Tooling