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Nov 6, 2025
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docs: clarify trace function implementation used by default depending on Python version #2067

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docs: clarify trace function implementation used by default depending…
mschoettle Oct 16, 2025
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6 changes: 4 additions & 2 deletions doc/config.rst
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Expand Up @@ -335,8 +335,10 @@ Before version 4.2, this option only accepted a single string.

(string) Specify which trace function implementation to use. Valid values are:
"pytrace" for the pure Python implementation, "ctrace" for the C implementation
(default), or "sysmon" for the :mod:`sys.monitoring <python:sys.monitoring>`
implementation (Python 3.12+ only).
(default until Python 3.13),
or "sysmon" (Python 3.12+ only) for the
:mod:`sys.monitoring <python:sys.monitoring>`
implementation (default with Python 3.14+).

This was previously only available as the COVERAGE_CORE environment variable.
Note that the "sysmon" core does not yet support plugins or dynamic contexts.
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