Function
zope.security.proxy.isinstance

Signature

isinstance(object, cls)

Documentation String

Test whether an object is an instance of a type.

This works even if the object is security proxied:

>>> class C1(object):
...     pass
>>> c = C1()
>>> isinstance(c, C1)
True
>>> from zope.security.checker import ProxyFactory
>>> isinstance(ProxyFactory(c), C1)
True
>>> class C2(C1):
...     pass
>>> c = C2()
>>> isinstance(c, C1)
True
>>> from zope.security.checker import ProxyFactory
>>> isinstance(ProxyFactory(c), C1)
True