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interfaces: add the optional `bdiff.xdiffblocks()` method...
interfaces: add the optional `bdiff.xdiffblocks()` method PyCharm flagged where this was called on the protocol class in `mdiff.py` in the previous commit, but pytype completely missed it. PyCharm is correct here, but I'm committing this separately to highlight this potential problem- some of the implementations don't implement _all_ of the methods the others do, and there's not a great way to indicate on a protocol class that a method or attribute is optional- that's kinda the opposite of what static typing is about. Making the method an `Optional[Callable]` attribute works here, and keeps both PyCharm and pytype happy, and the generated `mdiff.pyi` and `modules.pyi` look reasonable. We might be getting a little lucky, because the method isn't invoked directly- it is returned from another method that selects which block function to use. Except since it is declared on the protocol class, every module needs this attribute (in theory, but in practice this doesn't seem to be checked), so the check for it on the module has to change from `hasattr()` to `getattr(..., None)`. We defer defining the optional attrs to the type checking phase as an extra precaution- that way it isn't an attr with a `None` value at runtime if someone is still using `hasattr()`. As to why pytype missed this, I have no clue. The generated `mdiff.pyi` even has the global variable typed as `bdiff: intmod.BDiff`, so uses of it really should comply with what is on the class, protocol class or not.
Matt Harbison - - Load All Authors

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exceptions.py
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# SPDX-License-Identifier: MIT
class FrozenError(AttributeError):
"""
A frozen/immutable instance or attribute have been attempted to be
modified.
It mirrors the behavior of ``namedtuples`` by using the same error message
and subclassing `AttributeError`.
.. versionadded:: 20.1.0
"""
msg = "can't set attribute"
args = [msg]
class FrozenInstanceError(FrozenError):
"""
A frozen instance has been attempted to be modified.
.. versionadded:: 16.1.0
"""
class FrozenAttributeError(FrozenError):
"""
A frozen attribute has been attempted to be modified.
.. versionadded:: 20.1.0
"""
class AttrsAttributeNotFoundError(ValueError):
"""
An ``attrs`` function couldn't find an attribute that the user asked for.
.. versionadded:: 16.2.0
"""
class NotAnAttrsClassError(ValueError):
"""
A non-``attrs`` class has been passed into an ``attrs`` function.
.. versionadded:: 16.2.0
"""
class DefaultAlreadySetError(RuntimeError):
"""
A default has been set using ``attr.ib()`` and is attempted to be reset
using the decorator.
.. versionadded:: 17.1.0
"""
class UnannotatedAttributeError(RuntimeError):
"""
A class with ``auto_attribs=True`` has an ``attr.ib()`` without a type
annotation.
.. versionadded:: 17.3.0
"""
class PythonTooOldError(RuntimeError):
"""
It was attempted to use an ``attrs`` feature that requires a newer Python
version.
.. versionadded:: 18.2.0
"""
class NotCallableError(TypeError):
"""
A ``attr.ib()`` requiring a callable has been set with a value
that is not callable.
.. versionadded:: 19.2.0
"""
def __init__(self, msg, value):
super(TypeError, self).__init__(msg, value)
self.msg = msg
self.value = value
def __str__(self):
return str(self.msg)