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[PR #14257/38e9af8b backport][9.0.x] docs: explain +/- markers in failed string equality diffs #14266

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nicoddemus merged 1 commit into from
Mar 6, 2026
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[PR #14257/38e9af8b backport][9.0.x] docs: explain +/- markers in failed string equality diffs #14266

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4 changes: 4 additions & 0 deletions doc/en/how-to/assert.rst
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Expand Up @@ -436,6 +436,10 @@ Special comparisons are done for a number of cases:
* comparing long sequences: first failing indices
* comparing dicts: different entries

In string context diffs, lines prefixed with ``-`` come from the left-hand side
of ``assert left == right``, while lines prefixed with ``+`` come from the
right-hand side.

See the :ref:`reporting demo <tbreportdemo>` for many more examples.

Defining your own explanation for failed assertions
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