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Python Debugging Cheat Sheet/Stop after first failure

Fail fast and debug one issue at a time.

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Section: pytest and unittest Debugging

Stop after first failure

bash
bash
pytest -x

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Same sheet · prioritizing pytest and unittest Debugging
Drop into pdb on failure
Open the debugger automatically when a test fails.
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Disable output capture
See print statements and standard output live.
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Run one test function
Narrow execution to one failing test quickly.
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Re-run only last failed tests
Speed up debugging after a failing run.
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Show local variables in tracebacks
Reveal local state in failing assertions and exceptions.
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Run unittest in verbose mode
See each test case as it runs.
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