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File size: 334 Bytes
5eb110b | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 | from zope.interface import invariant
def required_contact(obj):
if not (obj.email or obj.phone):
raise Exception("At least one contact info is required")
class IPerson(Interface):
name = Attribute("Name")
email = Attribute("Email Address")
phone = Attribute("Phone Number")
invariant(required_contact)
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