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												b	iicCsdS(snInvaiants can be deined in line

          >>> from zope.interface.exceptions import Invalid
          >>> from zope.interface import Interface
          >>> from zope.interface import Attribute
          >>> from zope.interface import implements
          >>> from zope.interface import invariant
          >>> class IRange(Interface):
          ...     min = Attribute("Lower bound")
          ...     max = Attribute("Upper bound")
          ...
          ...     @invariant
          ...     def range_invariant(ob):
          ...         if ob.max < ob.min:
          ...             raise Invalid('max < min')


          >>> class Range(object):
          ...     implements(IRange)
          ...
          ...     def __init__(self, min, max):
          ...         self.min, self.max = min, max

          >>> from zope.interface.exceptions import Invalid
          >>> IRange.validateInvariants(Range(1,2))
          >>> IRange.validateInvariants(Range(1,1))
          >>> try:
          ...     IRange.validateInvariants(Range(2,1))
          ... except Invalid, e:
          ...     str(e)
          'max < min'


        N((((sG/usr/lib/python2.7/dist-packages/zope/interface/tests/test_interface.pyttest_invariant_as_decoratorcscCsdS(s See https://bugs.launchpad.net/zope.interface/+bug/185974

There was a bug where the cache used by Specification.get() was not
cleared when the bases were changed.

    >>> from zope.interface import Interface
    >>> from zope.interface import Attribute
    >>> class I1(Interface):
    ...     a = Attribute('a')

    >>> class I2(I1):
    ...     pass

    >>> class I3(I2):
    ...     pass

    >>> I3.get('a') is I1.get('a')
    True
    >>> I2.__bases__ = (Interface,)
    >>> I3.get('a') is None
    True
    N((((sG/usr/lib/python2.7/dist-packages/zope/interface/tests/test_interface.pyt!test_description_cache_managementscCstjt}|jtjdtjd
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B|jtjd	didd6dtj	tj
B|S(Nszope.interface.interfaceiis
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test_suites

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