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@@ -235,6 +235,36 @@ class PersonCollection:
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return self.__children[parent]
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return self.get_children(parent.identifier)
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+ def get_coparents(
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+ self, parent: typing.Union[Person, str]
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+ ) -> typing.Iterator[Person]:
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+ """
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+ >>> c = PersonCollection()
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+
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+ >>> alice = Person('alice')
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+ >>> alice.father = Person('bob')
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+ >>> c.add_person(alice)
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+ Person(alice)
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+ >>> list(c.get_coparents('bob'))
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+ []
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+
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+ >>> alice.mother = Person('carol')
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+ >>> c.add_person(alice)
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+ Person(alice)
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+ >>> list(c.get_coparents('bob'))
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+ [Person(carol)]
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+ >>> list(c.get_coparents(c['carol']))
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+ [Person(bob)]
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+ """
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+ if isinstance(parent, Person):
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+ for coparent in self.get_coparents(parent.identifier):
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+ yield coparent
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+ return
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+ for child in self.get_children(parent):
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+ for coparent in child.parents:
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+ if coparent.identifier != parent:
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+ yield coparent
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+
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def __iter__(self) -> "PersonCollection":
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"""
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>>> c = PersonCollection()
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