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DoesNotImplement(interface[, target])
The *target* (optional) does not implement the *interface*.
.. versionchanged:: 5.0.0
Add the *target* argument and attribute, and change the resulting
string value of this object accordingly.
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The *target* (optional) is missing the attribute *name*.
.. versionchanged:: 5.0.0
Add the *target* argument and attribute, and change the resulting
string value of this object accordingly.
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BrokenMethodImplementation(method, message[, implementation, interface, target])
The *target* (optional) has a *method* in *implementation* that violates
its contract in a way described by *mess*.
.. versionchanged:: 5.0.0
Add the *interface* and *target* argument and attribute,
and change the resulting string value of this object accordingly.
The *method* can either be a simple string or a ``Method`` object.
.. versionchanged:: 5.0.0
If *implementation* is given, then the *message* will have the
string "implementation" replaced with an short but informative
representation of *implementation*.
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The *target* has failed to implement the *interface* in
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The failures are described by *exceptions*, a collection of
other `Invalid` instances.
.. versionadded:: 5.0
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