[top] / zope / interface / interfaces / IDeclaration
Interface declaration
Declarations are used to express the interfaces implemented by classes or provided by objects.
__sro__
(Attribute)
Specification-resolution order
A tuple of the specification and all of it's ancestor specifications from most specific to least specific.
(This is similar to the method-resolution order for new-style classes.)
__bases__
(Attribute)
Base specifications
A tuple if specifications from which this specification is directly derived.
* = required
isOrExtends(other)
Test whether the specification is or extends another
__nonzero__()
Return a true value of the interface specification is non-empty
get(name, default=None)
Look up the description for a name
If the named attribute is not defined, the default is returned.
__contains__(interface)
Test whether an interface is in the specification
Return true if the given interface is one of the interfaces in the specification and false otherwise.
weakref(callback=None)
Return a weakref to the specification
This method is, regrettably, needed to allow weakrefs to be computed to security-proxied specifications. While the zope.interface package does not require zope.security or zope.proxy, it has to be able to coexist with it.
__iter__()
Return an iterator for the interfaces in the specification
extends(other, strict=True)
Test whether a specification extends another
The specification extends other if it has other as a base interface or if one of it's bases extends other.
If strict is false, then the specification extends itself.
__add__(interfaces)
Create an interface specification with some interfaces added
The argument can be an interface or an interface specifications. The interface or interfaces given in a specification are added to the interface specification.
Adding an interface that is already in the specification does not raise an error. Doing so has no effect.
__sub__(interfaces)
Create an interface specification with some interfaces excluded
The argument can be an interface or an interface specifications. The interface or interfaces given in a specification are subtracted from the interface specification.
Removing an interface that is not in the specification does not raise an error. Doing so has no effect.
Removing an interface also removes sub-interfaces of the interface.
flattened()
Return an iterator of all included and extended interfaces
An iterator is returned for all interfaces either included in or extended by interfaces included in the specifications without duplicates. The interfaces are in "interface resolution order". The interface resolution order is such that base interfaces are listed after interfaces that extend them and, otherwise, interfaces are included in the order that they were defined in the specification.
There are no specific adapters registered for this interface.
There are no extended adapters registered for this interface.
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