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Create a key function that can be used to sort errors by relevance.
Arguments:
weak (set):
a collection of validator names to consider to be "weak".
If there are two errors at the same level of the instance
and one is in the set of weak validator names, the other
error will take priority. By default, :validator:`anyOf` and
:validator:`oneOf` are considered weak validators and will
be superseded by other same-level validation errors.
strong (set):
a collection of validator names to consider to be "strong"
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Try to find an error that appears to be the best match among given errors.
In general, errors that are higher up in the instance (i.e. for which
`ValidationError.path` is shorter) are considered better matches,
since they indicate "more" is wrong with the instance.
If the resulting match is either :validator:`oneOf` or :validator:`anyOf`,
the *opposite* assumption is made -- i.e. the deepest error is picked,
since these validators only need to match once, and any other errors may
not be relevant.
Arguments:
errors (collections.Iterable):
the errors to select from. Do not provide a mixture of
errors from different validation attempts (i.e. from
different instances or schemas), since it won't produce
sensical output.
key (collections.Callable):
the key to use when sorting errors. See `relevance` and
transitively `by_relevance` for more details (the default is
to sort with the defaults of that function). Changing the
default is only useful if you want to change the function
that rates errors but still want the error context descent
done by this function.
Returns:
the best matching error, or ``None`` if the iterable was empty
.. note::
This function is a heuristic. Its return value may change for a given
set of inputs from version to version if better heuristics are added.
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