Martijn Pieters added the comment:
Sorry, that should have read "the forward references section of PEP 484".
The section uses this example:
# File models/a.py
from models import b
class A(Model):
def foo(self, b: 'b.B'): ...
# File models/b.py
from models import a
class B(Model):
def bar(self, a: 'a.A'): ...
# File main.py
from models.a import A
from models.b import B
which doesn't fail because the forward references are not being tested until
after all imports have completed; creating a Union however triggers a subclass
test between the different types in the union.
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<http://bugs.python.org/issue26477>
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