Function
zope.interface.declarations.implements

Signature

implements(*interfaces)

Documentation String

Declare interfaces implemented by instances of a class

This function is called in a class definition.

The arguments 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.

Previous declarations include declarations for base classes unless implementsOnly was used.

This function is provided for convenience. It provides a more convenient way to call classImplements. For example:

implements(I1)

is equivalent to calling:

classImplements(C, I1)

after the class has been created.

Consider the following example:

>>> from zope.interface import Interface
>>> class IA1(Interface): pass
...
>>> class IA2(Interface): pass
...
>>> class IB(Interface): pass
...
>>> class IC(Interface): pass
...
>>> class A(object): implements(IA1, IA2)
...
>>> class B(object): implements(IB)
...

>>> class C(A, B):
...    implements(IC)

>>> ob = C()
>>> int(IA1 in providedBy(ob))
1
>>> int(IA2 in providedBy(ob))
1
>>> int(IB in providedBy(ob))
1
>>> int(IC in providedBy(ob))
1

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