Test your knowledge: Python warnings

Review

1. What is the usual purpose of a warning?

   Warnings communicate advisory conditions; only filters configured to treat them as errors make them exceptions.
2. Which category is generally intended for developers whose code uses a deprecated API?

   DeprecationWarning targets Python developers; FutureWarning is intended for application end users.
3. Why would a helper call warnings.warn(..., stacklevel=2)?

   Using stacklevel=2 skips the helper frame and points to the call site.
4. What does the error filter action do for a matching warning?

   The error action raises the warning as an exception, which can make tests fail on discouraged behavior.
5. How should a test reliably capture repeated warnings from a function?

   The capture context records WarningMessage objects and the always filter avoids usual repetition suppression during the test.