Consider the following type stubs:

# foo/__init__.pyi
class Foo: ...

# foo/bar.pyi
from . import Foo
class Bar(Foo): ...

When parsing foo/bar.pyi, pytype fails with:

ParseError: Unexpected class base: Module(name='Foo', module_name='foo.Foo')

pytype erroneously assumes that Foo is a submodule. A workaround is to replace from . import Foo with from foo import Foo.

Context: python/typeshed#5192