Martijn Pieters added the comment:
A temporary work-around is to use a function to raise a NameError exception
when the module attribute doesn't exist yet:
def _forward_A_reference():
try:
return a.A
except AttributeError:
# not yet..
raise NameError('A')
class B:
def spam(self: 'B', eggs: typing.Union['_forward_A_reference()', None]):
pass
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<http://bugs.python.org/issue26477>
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