Function
zope.interface.declarations.classImplements

Signature

classImplements(cls, *interfaces)

Documentation String

Declare additional interfaces implemented for instances of a class

The arguments after the class are one or more interfaces or interface specifications (IDeclaration objects).

The interfaces given (including the interfaces in the specifications) are added to any interfaces previously declared.

Consider the following example:

>>> from zope.interface import Interface
>>> class I1(Interface): pass
...
>>> class I2(Interface): pass
...
>>> class I3(Interface): pass
...
>>> class I4(Interface): pass
...
>>> class I5(Interface): pass
...
>>> class A(object):
...   implements(I3)
>>> class B(object):
...   implements(I4)
>>> class C(A, B):
...   pass
>>> classImplements(C, I1, I2)
>>> [i.getName() for i in implementedBy(C)]
['I1', 'I2', 'I3', 'I4']
>>> classImplements(C, I5)
>>> [i.getName() for i in implementedBy(C)]
['I1', 'I2', 'I5', 'I3', 'I4']

Instances of C provide I1, I2, I5, and whatever interfaces instances of A and B provide.